# User:Phol ende wodan/YANI/YASI
This page is an attempt to list YASIs that come up on several NetHack-related IRC channels. I have made this list separate from my other list.
Attribution will be listed wherever possible, and feel free to add any more that aren't here. While YASIs are not intended to be taken seriously, they might still find some use if listed here.

Silly Idea

Variant

Source

New "farmer" role: starts with seeds and a spade, has other tools available like sickles and scythes.

jonadab

Opening a cursed bag of holding does not destroy the items, but it redistributes them around the level, or perhaps the entire dungeon.

Grasshopper, AmyBSOD

Dropping a ring of polymorph control down a sink, then a ring of polymorph, turns the sink into a regularly erupting geyser.

FIQ

The Mazes of Menace are located on the moon Titan, to mess with day/night and moon phases.

rumflump

Donkeys that carry around the player's loot. If you kick a pet donkey, you get the YAFM "You kick your own ass!"

jonathanhanes, Grasshopper

Playable race that doesn't have teeth and can't eat anything unless polymorphed into something that can.

aosdict

New scroll label CONULATION (apparently it is CONGRATULATIONS minus GRATS?)

aosdict

Potion of un-dilution. Does nothing when quaffed or thrown. Only effect is that when you dip a diluted stack of potions into it, they become undiluted.

aosdict

Trap which pushes the player one level higher, like a potion of gain level.

aosdict

Oilskin sack of cancellation, which cancels items that you put into it.

AmyBSOD

Priest players, if they are at XL 30 (with the "High Priest(ess)" rank title), can kill their own high priest and take over, becoming the new high priest.

aosdict

If you genocide @, you only die if you have showrace turned off so your symbol is a @. If you have showrace turned on, you live, but if you ever turn it off again that game, you die.

Wooble

Lego trap. If you're not wearing metal boots, you take damage when you step on it.

FIQ

Chicken soup that cures constitution loss when consumed. When thrown at a shade, wraith or ghost, it is instakilled (chicken soup is good for the soul).

bug_sniper, aosdict

Dipping a thirsty weapon into water or a potion of blood makes it satisfied. Hitting things with a satisfied weapon removes their hunger.

bug_sniper, jonadab

Burying a troll corpse results in a troll zombie, which is twice as likely to reanimate. Sticking a troll corpse in an ice box results in an ice troll emerging from the box. Dumping a troll in lava results in a lava troll. Dumping a troll corpse in water results in a water troll. Locking a troll corpse in a box results in a freedom fighter troll, who goes around liberating all the other trolls from their boxes.

Tangles, jonadab, aosdict

Tasp: charged ranged tool that works on monsters that have a mind and are not immaterial. It paralyzes for one turn, dealing no damage, and has a small chance of taming. To keep the monster tame, you have to keep tasping it occasionally. Applied to yourself, it cures hallucinations by electroshock therapy.

jonadab, Grasshopper

Add a corpse swinging skill, which increases your odds of hitting with a wielded corpse. Only Cavemen can get skill in it.

aosdict

You can apply Fire Brand to an adjacent tame rothe to brand it with your cattle mark.

aosdict

Pools of oil, black or brown }

FIQ

Rather than spell schools, every spell must be trained individually, costing the same amount of skill points as normal.

AmyBSOD

Rename the mundane two-handed sword to "claymore". Apply it to adjacent tiles to create a land mine.

jonadab

Hobbit nuns, and nuns as a playable role that can use a #sing command.

jonadab

Roaming shopkeepers, that will attack and kill you even before you break any doors.

bug_sniper

You can #jump onto tiny monsters, which makes a Dex check. If successful the monster is squashed.

AmyBSOD

Deli shopkeepers sometimes have a tinning kit in inventory. If a monster dies in their shop, they will instantly tin its corpse and drop the tin in their shop for sale.

jonadab

You can eat leather while starving.

ChaseSP

Eating a bag of holding lets you store items in your stomach.

aosdict

Eating a magic lamp gives you intrinsic light.

Wooble

Potion of solipsism: gives every other monster on the level temporary phasing because you're not sure whether they're figments of your imagination or not.

aosdict

Artifact Peril-Sensitive Sunglasses, which when equipped cause blindness and warning when a monster is in line of sight.

jonadab

Librarian monster whose attack breaks illiterate conduct.

jonathanhanes

The Candelabrum of Invocation, if it contains 7 candles of invocation, can be used to do the invocation without the other invocation items / from anywhere in the dungeon

dnethack

Chris, AmyBSOD

Pets you get from other players' bones files that were the pets of the dead adventurer are harder to make do what you want, like in Pokemon.

aosdict

Wand of alignment conversion, which will convert the alignment of both altars and priests tending those altars, so the priest may not get angry. Also a potion of change alignment.

bug_sniper

Hill orcs can grow up into hell orcs, which are much stronger and normally spawn only in Gehennom.

aosdict

Winter wolves can grow up into spring wolves, which can coil their body and launch themselves several spaces in one linear move to attack, damaging you from the impact and landing next to you.

jonadab

Pinball monster: Has a fast speed, rolls around and bounces into walls, and occasionally teleports. Uses the S_BOULDER symbol. If you kick it, it changes direction.

FIQ, aosdict, jonadab

Add charm monster to the list of maintainable spells. If you maintain charm monster, you automatically cast it any time you're next to a hostile monster.

FIQhack

jonadab

Add a spellbook of wish, but it is not randomly generated, unwishable, costs over 100 ink minimum to write, and is level 27 so nobody can cast it.

aosdict, jonadab

Amulet of undead turning. If you die while wearing it, you rise from the grave as a zombie. If an undead monster dies while wearing it, it has the same effect as an amulet of life saving. Related: a cursed amulet of life saving will save you if and only if you are undead. Also related: an amulet of death saving, which has the same randomized appearance as life saving, which saves undead and instakills any living creature that wears it.

aosdict, raisse

Fire gloves and ice gloves that send a bolt of fire or cold in the direction you hit.

Wooble

If your terminal is big enough, whenever the game makes a die roll, you must watch an ASCII-art animation of the die roll.

jonadab

Spinach monster, whose corpse when tinned becomes a tin of spinach.

aosdict

Pun mode, an option that only allows messages containing puns to be printed.

jonadab

Potions of wonder can give the "Yendor" property to any amulet upon dipping, which gives it the properties of the Amulet of Yendor.

FIQhack

aosdict

Some locked doors may open easily from one side (because they have a deadbolt or other easy latch). Secret doors or formerly secret doors have no method of opening on one side and must be kicked down.

aosdict

Instead of doing nothing, a blessed scroll of punishment punishes you, but with a longer chain.

jonadab

Ring of illness: a ring that causes the fatal illness timer to start, and autocurses when worn, but will reliably cure illness when removed.

jonadab

If you're polymorphed into a water moccasin, you can crawl into a fountain to travel to any fountain in the game.

FIQ

#shout works to send mail to someone in another game on the same server. Uses engraving erosion code because it's from far away.

bug_sniper, Tangles

#yodel and #karaoke commands to make nearby peaceful and tame monsters hostile.

jonadab, K2

Cans of grease appear as "a tin" while unidentified.

aosdict

Herrings that can be used as axes, because of Monty Python.

bug_sniper

The Plane of Tedium, which is 8000x2400 with the viewport scrolling with the character to keep them on the screen.

jonadab

Spambots that attack by throwing tins of rotten spam at you.

bug_sniper

Remembrall, a tool made of glass (it could even be a "glass orb" when unidentified) that cures amnesia.

aosdict

Separate spells that convert every type of material into every other type of material (metal to flesh, stone to metal, cloth to paper, stone to cloth, etc).

bug_sniper, aosdict

Monsters' resistance to Elbereth is dependent on how many games you have played.

FIQ

If you are hallucinating/confused and use a magic whistle, any pets may get hit with a magic missile instead.

Menche

1/50 player-character monsters will only move orthogonally, because their laptop doesn't have a numpad and they are stubbornly using the arrow keys.

jonadab

Remove Quest nemeses' petrification resistance, because making it feasible to play around with a c corpse means the player might YASD with it.

Wooble

Rename the Dark One to the Dim One.

ChrisE

Starting to levitate/fly should give the message "You ascend."

Wooble

Tame kittens will randomly stop to lick themselves or fall asleep.

Wooble

Occasionally generate 2x2 squares in rock with a few gold pieces embedded in each, to trick people into digging for it.

aosdict

At most one treasure zoo in the game is actually called "David's treasure zoo", and it contains a player monster named David.

aosdict

Dehydrated conduct, which is broken if you drink potions, quaff fountains or sinks, or go in water.

stenno

While invisible, you are always blind. This is because photons are passing straight through your eyes and the rest of your head without actually hitting your retinas.

aosdict

Masonry that smooths out the surfaces of luckstones, so they stack.

bug_sniper

If you are playing the Noble role, you cannot squeeze past boulders at all, because you are "portly".

dNetHack

aosdict

Horseflies, ridable flying monsters that are Tiny size.

bug_sniper

Make a Strength check for bugling the notes A, B, D or F, since such notes are theoretically possible to play on a bugle but require you to blow almost impossibly hard.

aosdict

At most one treasure zoo in the game is actually designated and introduced to the player as "David's treasure zoo". This zoo contains a player monster named David.

aosdict

Legal blindness, a birth option that is not quite as blind as permablind. You can see only one square around you for the whole game regardless of lighting.

aosdict

Allow the options parser to parse the typo POTIONS= the same as OPTIONS=.

aosdict

Zombies pregenerate with a given number of eyes and ears, like you would see in Dwarf Fortress. Slashing attacks have a chance to remove their ears and piercing attacks have a chance to remove their eyes. With no ears or eyes left, they become deaf or blind respectively.

aosdict

Digless conduct, broken when you dig.

Tangles

New artifact Houchou Jr. It is a spork that instakills anything it's thrown at, but only in forks of NetHack.

aosdict

Possessing a utensil should prevent your hands from getting glibbed from eating a greasy tin

bug_sniper

A negative "anticoagulation" intrinsic, which prevents your wounds from healing up, so bleeding effects continue draining HP, and probably eventually kill you.

AmyBSOD, jonadab

If you die and one of your pets comes across your corpse with a wand of undead turning before you rot away, it can zap your corpse with the wand and bring you back to life; your game does not end.

FIQhack

aosdict

Dipping potions into fountains may produce diluted potions of sickness.

FIQ

If playing a vampire who hates blessed stuff, Wizard of Yendor harassment may bless your items instead of cursing them.

dNetHack

ais523

Classify ice boxes as magical tools, since they manage to stay cold permanently without any supply of ice.

aosdict

A branch where gravity is reversed, so you walk on the ceiling and trapdoors make you fall through to higher levels.

AmyBSOD

Potions can be generated diluted, remain diluted when polypiled, and cannot be used in alchemy at all.

AmyBSOD

If you throw an unlit potion of oil and a fire elemental is in its path, it passes through and lights the potion of oil.

jonadab

Water elementals should count as unsolid, because clearly they are liquid.

aosdict

The 119th monster of its type that gets killed drops an artifact that instakills any monster of that type, except there can only ever be one more of it generated.

rikersan

A weapon that conveys the "freezing" property, which makes you shiver and eventually freeze to death if you don't drop it.

bug_sniper

If you are watching a game in which someone stone to fleshes a statue of you, you control whether you become peaceful, tame, or hostile.

bug_sniper

If you steal a mummy's wrapping, it becomes invisible.

jonadab

Reading spellbooks while hallucinating lets you learn hallucinatory spells, which can only be cast while hallucinating and have funny messages but no gameplay effect.

jonadab

Food left in an ice box for long enough will become freezer burned.

aosdict

Bucket, a tool inspired by Minecraft. When applied to an adjacent water or lava square, it scoops up all the fluid, turning it to a normal floor tile, and can be applied somewhere else to dump it. Carrying a lava bucket in inventory does not harm the player.

aosdict

Magic markers that write in invisible ink. A scroll written with invisible ink appears to be blank unless you can see invisible, in which case you can read it.

aosdict

Pokedex-like feature that can give you limited information about enemies you have seen, but can only give you full information when you "capture" it by tinning its corpse.

aosdict

Altars to Elbereth. They are colored green, and sacrificing to Elbereth angers your own deity but makes engraving Elbereth more effective.

jonadab

Aluminum foil, a tool that can be applied to corpses to keep them safe to eat until they rot away, at the expense of using up the foil.

jonadab

Replace the string "for" with "four" everywhere it appears in Nethack Fourk. Fourtune cookies, spell of fource bolt, #fource, etc.

Fourk

aosdict

All three gods mess around with you in the endgame by smiting you, protecting you, sending minions after you, smiting the minions, etc. For bonus stupid, they only do this if you are an atheist.

FIQ, rikersan

Shopkeeper role where the whole adventure is flavored as collecting a lot of loot, including the Amulet of Yendor, to stock your shop. The quest leader is One-Eyed Sam, the quest nemesis is the Master of Thieves. Again.

aosdict

Nigerian Prince monster. Asks for a lot of gold, and promises to return with much more than what you pay him. Totally. Guaranteed.

rikersan

Valkyries always start with snow boots, which might be levitation, fumble, speed, kicking, or anything else they can randomly be.

FIQ

When a werewolf is killed in wolf form, it can revert to a vampire, since vampires can also turn into wolves, and vice versa.

jonadab

For variants that include bards, add grand pianos as a \. You can use it to produce more powerful music or music with a larger range.

aosdict

NetHack Caption Contests - a random jumble of characters is posted, and people have to come up with a story for it.

aosdict

Eating footrice in a polyform that is immune to stoning can give you intrinsic petrification resistance. This turns instapetrifications into slow petrifications, and makes slow petrifications take longer.

FIQ

A game mode where you play as the High Priest of Moloch, and the game sends a swarm of ever-more-powerful adventurers to come kill you.

jonadab

Lord Surtur should wield Fire Brand if it is not already generated, because his mythology has him wielding a flaming sword.

aosdict

Wand of teleoperation - it allows you to read/zap/apply items in the path of the beam

oh6

Rapiers and scimitars get a damage bonus from Charisma if your character can make puns during the attack.

jonadab

Most weapons should have a fairly common monster (perhaps a Gehennom monster) that is resistant to them.

ais523

The "heavy" modifier (used normally for iron balls) works on all wishes.

ais523

In line with the "Barbarians hate magic" flavor, they can always get Magicbane as a sacrifice gift.

aosdict

In variants with #shout commands, shouting wakes up all monsters in a radius dependent on XL.

aosdict

The Rogue quest artifact is now the "Robbin' HUD", which gives you all sorts of neat status displays for how you can steal from monsters.

aosdict

Lizards and other&nbsp;: class monsters can also drop scales, but the scales aren't useful.

jonadab

You can apply a potion of water to an adjacent maple tree to turn it into a potion of maple sap. When heated, it will turn into a potion of maple syrup (drink for good nutrition) instead of boiling and exploding.

aosdict

With X-ray vision / astral vision, the only monsters you can see through walls are skeletons.

aosdict

A spellbook of aspersions that lets you cast aspersions on other monsters.

ChrisE

Legend of Zelda Dungeon Map. Lets you see all levels' walls and corridor outlines.

aosdict

Birthday candles, an extremely rare tool that if you light it and then snuff it, it grants a wish and then disappears. Unidentified description is "a candle".

aosdict

Add "eye of misspelling" and "staff of misspelling" as valid wishes for the Eye of the Aethiopica and the Staff of Aesculapius.

aosdict

Woodchuck race, which is basically playing the game permanently polymorphed into a woodchuck, with no benefits on top of those conferred by the polyform.

aosdict

Add 50 more types of polearms, with similar but not identical stats.

jonadab

Triggering a bear trap removes all your armor and jewelry and spawns a bear to attack you.

jonadab

"Gender studies professor" role: gets politically correct pronouns for every monster, item, trap, staircase, etc in the game.

AmyBSOD

Whenever a purple worm goes "Burrrrp!" and there is a lawful speaking monster within some range, the lawful monster says "Say excuse me!"

Grasshopper

On Halloween, generate only candy bars whenever food would be generated.

Webmant

In December, boulders become ice boulders which can be melted, and rocks become snowballs that you can throw at enemies to deal cold damage.

amateur_hour

If the player sets !bones, skeletons do not generate in the game.

ChrisE

Boots of rocket jumping.

aosdict

Flying iron bars on the Plane of Air that can crash into you.

bug_sniper

Gnomish characters get intrinsic phasing at level 30.

aosdict

You can invoke the Amulet to grant wishes, but this forces you to continue doing so every 50 turns, with an increasing chance of killing you outright every time you do so.

FIQ

You can give the Amulet to your pet so it can ascend instead of you, giving you a suboptimal but still good ending.

bug_sniper

Rubbing iron items on a loadstone either breaks the item or magnetizes it, making it impossible to use or drop.

jonadab, ais523

Scroll of destroy amour, cancels all foocubi on the current level.

aosdict

Reading scrolls while hallucinating has some random scroll-like effect.

Chris

Hallucination tiles, which get swapped in for the regular ones when you hallucinate.

jonadab

Scrolls of fire don't work on the Planes, except for the Plane of Fire.

FIQ

Magic chests contain one of each type of gray stone at the beginning of the game, so you can skip Mines' End if you're prepared to maybe get a loadstone.

jonadab

Cavemen have no concept of numbers, and no numbers will be shown to them at all.

Wooble

All races now have their own language, which you have to be able to read to play the game effectively: Gaelic for Knights, Japanese for samurai, English for tourists, Nordic runes for valkyrie. All input including wishes must be specified in this language too.

Wooble

Trollsbane instakills trolls by turning them into tins of troll meat.

aosdict

Smelling monsters is implemented outside of wizard mode, but it has no effect except to abuse wisdom.

Cborne

If you zap an acidic monster with a corrodable wand of striking, "The wand hits the foo!" and corrodes.

ChrisE

Health food stores sell hippie stuff like crystals (pieces of worthless glass and low-value gems like amethysts) and hallucinogens (tins of violet fungus and yellow mold), potions of hallucination.

aosdict

Sokoban is embedded in the Dungeons of Doom like the Wizard's Tower is, but is inaccessible in the same way.

jonadab

The initial contents of a magic chest contain one of each type of gray stone, so you can skip Mines' End if you're willing to take the chance of getting unlucky and picking a loadstone.

jonadab

If Vorpal Blade goes snicker-snack, and you are carrying Snickersnee, Vorpal Blade eats it. (Alternatively, it makes Snickersnee eat you.)

Wooble

Invisible walls: block vision only if you have see invisible.

FIQ

A tin golem, which tin openers are very effective against.

ChrisE

Minotaurs spawn much earlier in the game, but can only move like grid bugs.

FIQ

Reverse genociding quantum mechanics either raises Int by one point or confuses you.

aosdict, Zaha

If you are trapped in a pit and trying to get out, nearby hostiles can stomp on your hands and make it take longer to get out. This triggers spike damage again.

AmyBSOD

Lawful characters get an alignment bonus if they come across a bones pile, dig a pit, put the corpse in it, and fill it in, or "build a cairn" by dropping a huge pile of rocks on top of the corpse.

aosdict

Breaking a tin wand turns it into several tins.

flump

The game intentionally generates monsters in inconvenient places in Sokoban or makes them read scrolls of earth if your Luck is bad.

aosdict

Polymorph traps have an increased probability to generate sessile monsters so they don't go completely crazy in a crowd of monsters.

ais523

Artifact boomerang that lets you specify target squares.

deadnoob

A ward which is actually just the peace sign.

dNetHack

aosdict

Artifact Iron Boots from Zelda. The base type is a pair of iron shoes, and they make you very heavy and speed 3 when worn.

aosdict

Artifact rings of cold/fire resistance Frost Band and Fire Band.

aosdict

Crystal high heels made of glass, and an artifact version of them named Cinderella's Slippers.

dNetHack

AmyBSOD

The Staff of Saint Patrick, a quarterstaff that has bonuses versus snakes, acts as a luckstone, and will turn snakes (instead of undead) when wielded and the player #turns.

aosdict, statuesurfer, Menche

Harmonicas, a tonal instrument.

aosdict

New wand appearance "fourked wand". A wand with this random appearance is subject to the Wands Balance Patch.

Luxidream

Wand of boulders, which shoots boulders (?).

flump

Cursed two-handed weapons only weld to one hand, and do not prevent you from opening containers and casting spells; they are no worse than a one-handed weapon.

aosdict, jonadab

Killing all generated demon princes or killing all the Riders gives you an experience level.

flump

Intelligent monsters capable of speech can read spellbooks to you.

flump

Intelligence increases carrying capacity, because a smarter character is able to organize and balance their pack more evenly.

flump, Webmant

To-hit and damage get large penalties for a quarterstaff welded to your hands, since quarterstaff fighting involves moving your hands along the staff a lot.

aosdict

Paper is edible.

AmyBSOD

Priests can offer the Amulet of Yendor on the altar in their quest home level (the Arch Priest is probably pretty similar to a high priest).

aosdict

Some unique monsters can be created by naming an appropriate monster of the base type.

ChrisE

Archelogists can start with a woodchuck pet because they're an endangered species.

aosdict

An #evoke command, usable only by low-level wizard Evokers.

ChrisE

Pavlovian conditioning for pets; if you abuse it after it eats corpses you want, it will learn not to eat those corpses.

deadnoob

Allow the paranoid_confirmation option to be canceled with any input that's not "yes", including the empty string.

aosdict, Deuce-Zen

If you ask the Oracle about woodchucks, she becomes hostile and ZOTs you.

aosdict, jonadab

Master wand of wishing has a 0.000001% chance of granting a second wish.

FIQHack

Luxidream

Microtransactions, including things like:
First fountain quaff always gives a wish, costing $2.99.
Loot boxes that give you items with properties you don't have yet.
Paid access to MONSTERCOLORS and SYMBOLS options.

Luxidream, aosdict, mtf, jonadab

You can only offer the Amulet when it's blessed. Attempting to offer it otherwise will raise it from cursed to uncursed or from uncursed to blessed.

aosdict

Wand of fishing: asks you what you wish for, but it will only accept objects that you dropped into water previously.

AmyBSOD

Ice plate mail: shatters easily, deals cold damage to you and other monsters, melts if you take fire damage or enter Gehennom, or just eventually anyways.

aosdict

The message "The hair on the back of your neck stands up" does not print if you are a Rogue and have ever picked up the Master Key, because the quest text describes the hair on the back of your neck falling out when you do this.

aosdict

You can apply a knife to a jellyfish or a blue, ochre, or spotted jelly corpse to turn it into a jelly sandwich.

aosdict

If a tripe ration or other treat is stuck under a boulder, your pet will be biased towards hanging around the boulder waiting for you to roll it off and expose the treat.

deadnoob

Artifact crossbow that deals double damage when bashing monsters with it in melee, but only then.

jonadab

Monks get a single potion of restore ability as a crowning gift.

aosdict

Shopkeepers can shatter doors by kicking them.

aosdict

When polymorphed into a red dragon, hell hound, or anything else with a fire breath attack, the game accepts #burninate as an extended command (it does the same thing as #monster).

aosdict

You can make an evil alliance with the Wizard of Yendor to seek the Amulet. Until it inevitably falls apart when one of you actually gets it.

aosdict

If you dip Excalibur in a fountain as a neutral or chaotic, it may convert back into a regular longsword.

ais523

Attack helicopter gender. Gives flying but can't wear armor.

Slash'EM Extended

Luxidream

You can dig down in Moloch's Sanctum but fall into a level made entirely of lava.

Webmant, aosdict

Make Trollsbane a chaotic artifact, and your god snickers when they give it to you.

FIQ

All gems generate uncut, but you can get them cut somewhere to greatly increase their value.

aosdict

You get a free artifact gift if you start a game during Christmas.

bug_sniper

Eating apples causes nurses and quantum mechanics to flee, because an apple a day keeps the (MD or PhD) doctor away.

bug_sniper

If playing as a troll in FIQHack and you die, your corpse lies there for as long as any troll corpse would and intelligent monsters will try to throw it in water or lock it in a box or eat it to dispose of you.

aosdict

Falling down a ladder has a 50% chance of a -1 Luck penalty, because you fell beneath it.

Jendic

Replace the intro text's "It is written in the Book of 

<deity>" with the name of some player who has won a sufficiently long streak.

FIQ

Wand of undead burning: is basically just a renamed wand of fire.

aosdict

Add a scroll label OM NOM NOM, or possibly replace YUM YUM with it.

aosdict

Mimics that imitate objects or dungeon features, but move.

ChrisE

Vlad's Tower has a secret hidden portal to Minetown, which is where he bought his candles in 3.6.0.

FIQ

Zapping a greased wand may slip. This gives it an equal 1/11 chance of zapping it in each direction (counting up, down, and at self.)

jonadab

Artifact kicking boots that explode whatever you kick, regardless what it's made of.

jonadab

To move pets that are polymorphed into sessile forms, you must plant them in a pot, which can then be carried around with you.

aosdict

Crossbows deal the same amount of damage regardless of skill... and damage is similar to a full barrage of arrows. Gnomes, of course, spawn with crossbows. The Gnomish Mines are now better known as the Gnomish Shooting Range.

NeroOneTrueKing

Reverse boomerang: instead of it returning to you, you teleport to wherever it landed.

ais523

Any attempt to steal from the Black Market transforms all the items in it into mimics.

ais523

Extra healing, cast at Skilled, creates a "healing explosion".

luxidream

Whenever a wand engraving effect affects "bugs on the floor", it applies to all adjacent non-flying bug-type monsters.

aosdict

When untrapping an arrow trap, also generate a bow (which has been firing the arrows).

aosdict

Add a throne as an alternate Sokoban prize.

jonadab

Monster spell "unextinct" that resets the born counter for a monster species.

jonadab

Intelligent monsters can untame your domestic pets by throwing food at them.

ais523

Hat mimic. Always imitates a fedora.

Slash'EM Extended

Luxidream

Add a new damage type AD_SXXX. It has the same effect as reading the scroll labeled "XIXAXA XOXAXA XUXAXA".

jonadab

Revolving doors that you can get stuck in and have to go around a lot of times to escape.

jonadab

Salt gems. When you dip them in water, it dissolves and the potion becomes a potion of saltwater.

aosdict, Luxidream, FIQ

Helm of beginner's luck: grants +13 Luck as long as the player is a beginner by score.

Luxidream

Some alchemy reactions are endothermic and can only be done properly while standing on top of a fire trap.

jonadab

When you are levitating and drop a potion of polymorph so that it shatters, objects on that square get polymorphed.

jonadab

The game parses your rc file to see whether you have menucolors set that apply to item beatitudes, and change the color of amber or black altar flashes to match those.

aosdict

If the player ever manages to create a lava square on the Plane of Water, it instantly turns into a boulder.

aosdict

When a player monster dies, a tombstone magically appears and their possessions are cursed with a random 4/5 chance.

FIQ

Object materials patch that allows the player to wish for iron items made out of GEMSTONE material.

aosdict

In addition to luck, alignment record, and anger, also track a fourth stat, karma. If your karma is very high when you die, you respawn on dungeon level 1 in the form of a cow.

jonadab

T-shirt cannon that can only quiver and fire T-shirts.

aosdict

While Death is dead, the player (and all monsters) have intrinsic lifesaving.

Deuce-Zen

You can't polymorph any glass items with a potion of polymorph. Obviously glass is immune to polymorph potion because it is the material used to contain it, and it doesn't polymorph its own vial.

aosdict

You can only get any effect from sitting on a throne if you are polymorphed into a royal monster.

wheals

At very low dexterity (5 or lower), trying to wield an edged weapon may result in you holding it the wrong way and hurting yourself.

AmyBSOD

Amulet of neck brace: prevents beheading while worn.

wheals

Rolling backpack, a container that you can drag behind you. Items in a rolling backpack don't have any weight but it is inconvenient to use: you must step back onto it to #loot it, you have to pick it up to bring it up stairs, if you try to roll it downstairs it will probably crash into you and make you tumble down the remaining stairs.

Luxidream, jonadab

Add kale. When eaten, it prints "You feel healthy." but doesn't actually give poison resistance.

aosdict

Long worms automatically eat any corpse that they produce with their bite attack, and automatically gain a tail segment like in the game Snake.

Tarmunora

Bank of Yendor ATMs that allow you to deposit and withdraw gold, with a 2% transaction fee.

jonadab

Ettins that are beheaded by Vorpal Blade don't get killed if they still have another head.

bug_sniper

Add another artifact war hammer Bugbane, which does more damage the smaller the target monster is and has bonuses against x and a. Its material is plastic. Is first sacrifice gift for Tourists.

jonadab, elenmirie

Insects grudge yellow and black lights.

jonadab

Priests in temples should have attendant altar boys.

K2

Hitting a water elemental with cold turns it into an ice elemental.

ChrisE

Eating the corpse of a dead adventurer in bones may confer any of the intrinsics that player formerly had.

FIQHack

aosdict

Smashing a potion of acid on a neutral altar turns it into an acidic altar.

ChrisE

Hitting a ghost with cold damage will incredibly rarely turn it into a milky potion.

aosdict

Fire and lightning blasts can hit the floor, overwriting any engraving there, allowing E to be wiped out at range.

aosdict

If you open a door and there's a previously unknown floating eye on the other side, you are frightened to death for a few turns.

aosdict

If you wish for a ridiculous negative enchanted item (within reason, down to about -100) the game should comply.

aosdict

Add a message "<your pet=""> hears the rumble of distant thunder..." when it causes your death.

scorchgeek

When you try to spellcast wearing a shield, your character automatically spends turns taking off the shield before you cast and putting it back on after.

Tarmunora

Fake Houchou that instahits and instakills any enemy, but it resurrects immediately.

ais523

Progress bar. Increases as you gain experience, complete achievements, and pick up ascension kit worthy items.

aosdict

Cockatrice mode: only cockatrices spawn, and they don't respect extinction.

aosdict

Ring of immunity to drawbridges: negates drawbridge-related instadeaths, and has no other effect.

aosdict

Potion of holey water, which eventually leaks away and disappears. Also bags of holeding, which cause items to fall out of them periodically.

ChrisE, raisse, nyingen, CursedFlames

IRC support built into the game.

aosdict

Ninja have the M1_CONCEAL flag, and can hide under any object no matter how small, because they're ninjas.

aosdict

Wield a tin of some monster meat and read enchant weapon to turn it into spinach.

aosdict

Spell of summon fungus, which summons several immobile F/j around the player.

aosdict

Trying to walk onto a space containing a statue gives you the "You harmlessly attack a statue." message.

ChrisE

Steampunk golems.

aosdict

The wish parser parses a request for "beauty" as the Eye of the Beholder.

SLASH'EM

aosdict

Add Moloch-aligned unicorns, u, which are invisible.

jonadab

Wand of capitalization, which changes monsters it is zapped at from lowercase to uppercase. If cursed, of course, it turns monsters lowercase instead.

Wooble, aosdict

#ragequit command. Equivalent to #quit but does not ask for confirmation.

AmyBSOD

Monster type "easter", which is oviparous. Easter eggs give YAFM in certain circumstances.

AmyBSOD

You can sacrifice eggs, as a terrible pun-based mechanic on "egg sac".

aosdict

The value of a corpse sacrifice is proportional to how hungry you are, and is worthless if you're Satiated or not hungry at all.

jonadab

Sword swallower role. Capable of eating swords even when not a metallivore (but only swords).

greqrg

Confused scrolls of punishment allow you to chain other monsters to an iron ball.

bug_sniper

Autotraveling in Sokoban auto-solves Sokoban.

riker

A command that is unambiguously a bad idea, which does something like give you permanent greasy fingers. If you type it, the game tells you "This is a bad idea. Do it anyway?".

ais523

Cavemen can knock down trees and use them as two-handed clubs.

jonadab

Lichenthropy.

aosdict, trwyth

Snickersnee can also go snicker-snack.

aosdict

Cursed identify changes the character's name ("identity theft").

jonadab

Wand of trapping that you can zap at doors and chests to trap them. If the beam doesn't end up hitting either, it'll place a random trap on the floor square where the beam ended.

jonadab

Make Medusa more threatening by giving her a blindfold-shredding melee attack.

aosdict

Paperback books can be comic books, which take time to read but have no other effect.

aosdict

Doppelganger variant where it takes on the form, name, and behavior of one of your pets until you get to sufficiently low HP or the original pet comes within sight, at which point it reverts to being hostile and attacks you.

Flan99

There is a random guaranteed library halfway through the dungeon that has books, scrolls, and a librarian who can identify them for a fee.

FIQ

Cursed speed boots force you to run everywhere, exhausting you and preventing you from doing things like stopping to pick up items.

trwyth, aosdict

Mithril gorgets that prevent decapitation.

aosdict

Polymorphing into a marilith gives you 12 ring slots.

stenno

If a crafting system is ever added, you can craft tombstones out of boulders.

aosdict

Silver dragon scales have all the effects of a mirror when applied. Silver dragons breathe mirror shards instead of cold. If you destroy silver dragon scales, you suffer the same Luck penalty as breaking a mirror.

Tarmunora

All black gems give black flashes when dropped on an altar. Amber stones always give an amber flash when dropped on an altar.

aosdict

Speedrunner role: the pantheon consists of Grasshopper (lawful), Tariru (neutral) and Adeon (chaotic).

aosdict, jonadab

Spray bottle that you can use to train your pets.

K2

Spells that are targeted like unskilled polearms (two squares away orthogonally) and hit only that one square.

jonadab

Enhanced fireball spells that have a 3 square radius, but which can only be targeted at range 2.

ais523

Give the Oracle a passive attack that summons nymphs, and give Izchak a passive attack that summons Demogorgon.

jonadab

If you're wielding a cockatrice egg that hatches, you are instantly stoned.

aosdict

If you set a land mine in Sokoban, the ever-present air currents immediately set it off.

aosdict

Electrical outlets in shop walls, that you can pay to use to recharge your brass lanterns and wands.

dizzylizzy

Dented pots can be used as containers, and add several slots to your inventory when worn.

aosdict, riker

If you leave fruit on the ground, it will become a tree in several thousand turns.

hothraxxa

Playable race that is incapable of applying anything.

jonadab

All monsters' colors are randomized at the start of the game.

jonadab

You can only heal yourself with a unicorn horn from a unicorn of your alignment. Otherwise they cause afflictions.

AmyBSOD

Once you kill the bugs on the floor via death wand engraving, any more messages relating to bugs on the floor on that square are suppressed.

Wooble

Farlookitis: a property that makes you automatically farlook every few turns.

jonadab

Add prominent NetHack community members as hallucinatory monsters.

K2

Time Stop spell: you gain a ton of movement points. This allows you to take lots of actions without anything else happening.

aosdict

Track each armor slot as a separate conduct, for those who aren't up to doing nudist.

jonadab

Shopkeepers don't let you into their shop if you are not wearing a shirt and shoes.

jonadab

Each unicorn horn restores one random affliction, but none of the others; so you can get a unicorn horn that is only good on hallucination, another that only works on sickness, etc.

aosdict

As a corresponding item to D&amp;D's Belt of Giant Strength, add a Belt of Nymph Strength in nethack.

aosdict

Hidden portal on the Rogue level that deletes your NetHack game and spawns you in a game of Rogue.

aosdict

Homeopathic potions, such as a potion of sickness that has been diluted in water so much that it now has healing properties. Can be sold in health food stores.

ChrisE

You take a point of fire damage when the Amulet of Yendor feels hot, unless resistant.

aosdict

The Astral Plane is so bright that you and monsters periodically get blinded.

mtf

Potion of orc brandy, which gives benefits to orc characters but sickens anyone else.

aosdict

If you eat a pet shortly after it ate something intrinsic-conferring, you get the regular chance for the intrinsics.

aosdict

You can hammer the 95 Theses into the door of a temple, which increases your Wisdom but makes you unable to pay priests for benefits in the future.

aosdict

A -1 luck penalty on major holidays to encourage players not to play the game and spend time with their family or friends.

aosdict

The high priest of Moloch is under sanctuary in his own temple, so you can't attack him. You have to find some way to kill him from outside the temple.

FIQ

Dragons drop d10 individual scales. In order to make scale mail, you must have collected at least 100 scales.

tubs

Rubbing a scroll on a rock or gray stone makes the stone vanish, because paper beats rock.

aosdict, Grasshopper, tubs, MiseryMyra, jonadab

Scroll of YANI. When read it implements a random YANI.

MiseryMyra

The Orcish Mines, which occasionally contains a peaceful Gnometown run by gnomes.

aosdict

In variants that have #shout, it can be used to wake the Master Assassin.

aosdict

Armor can be partly eaten. It will reduce AC if worn.

greqrg

Neutral Valkyries anger Odin by killing ravens.

Novel

Shiny monsters: behave identically to other monsters, but have a random color. 1/8192 monsters are shiny.

aosdict

Construction crew monsters, which if left unattended will start adding more floors to the dungeon.

NCommander

Whenever an impossible() call happens, the game creates an x class monster.

aosdict

When a unicorn horn drops from a unicorn, its beatitude is set according to the unicorn's alignment.

AmyBSOD

Naming an item that a shopkeeper owns incurs a usage fee.

AmyBSOD

Livelog mundane things such as picking up a new item, getting hungry, etc.

K2

Rusted weapons have a bad effect on mammals when they strike bare skin.

AmyBSOD

Pirate characters suffer from permanent monster displacement on all monsters, since they have only one eye (or wear an eyepatch) and lack depth perception.

aosdict

Scrolls of advertising which display sponsored content.

nervous

Using a copper wand has a 1/121 chance of summoning a random Keystone Kop.

Andrio

If you are multishooting and you can level up your skill in between shots, you can #enhance right there and then before taking your next shot.

aosdict

Enhance-less conduct.

greqrg

Rather than having cans of grease be a distinct item, implement them as tins.

jonadab

Spellbook of "Giant Foot", which causes a giant foot to stomp down above and crush the target. Its randomized appearance is "pythonic".

jonadab, aosdict

#monster-ing while polymorphed into a cockatrice makes you hallucinating.

rikersan

Monsters can drink booze to stop fleeing, but this confuses them.

aosdict

Spell of summon pastry: level 7 matter spell that creates a cream pie.

Luxidream

You can only save at altars. And it costs some gold every time, like in GTA 2.

dtype, AmyBSOD

Random scroll appearance "braille": cannot be read while wearing gloves.

jonadab

Forcing open a chest with a scalpel reveals organs.

nervous

Kicking foocubi may generate a sink.

ChrisE

Silver Appreciation Trainers. When they encounter a silver-hater, they convert it into being no longer silver-hating.

ChrisE

New lower-level versions of the Archon: "on", "demion", and "master on".

ChrisE

Gnomish spellcasters start the game with small-sized spellbooks that weigh less.

dNetHack

NeroOneTrueKing

Artifact lizard corpse that blocks stoning while carried and can be invoked to polymorph into a lizard.

rikersan

Using a tin whistle right next to a peaceful monster angers it.

AmyBSOD

Walking shoes allow you to walk even if otherwise unable to move.

nooodle

Samurai gnome monsters.

aosdict

When he's at low health, Vlad panics and pleads to be spared if he gives you the candelabrum.

FIQ

Wielding a scroll and hitting d-class monsters with it turns them peaceful.

zid

Artifact weapon that does quadruple damage but only in situations where you would incur an alignment penalty for attacking.

jonadab

When you drop/throw a single zorkmid into a fountain, the game says "You toss in the coin and make a wish. For what do you wish?" and after you enter something it merely says "If only...", not giving you anything.

aosdict, dizzylizzy

Limit the character name to 3 characters, to emulate arcade game high score lists.

jonadab

Race that starts the game with intrinsic strangulation and an amulet of magical breathing.

ais523

Brilliant blue potions increase Int when quaffed.

aosdict

Reading a scroll labeled ELBIB YLOH breaks atheist conduct.

aosdict

You can grease the floor to make it slippery (more or less the same as ice).

aosdict

Artifact Caveman-aligned saddle that can only be used to saddle mastodons.

greqrg

You can combine a lock pick with an axe to make a pick-axe.

ChrisE

Options to hide monsters that you don't like from view.

ChrisE

Monsters can decide to #quit, which removes them (and their inventory) from the game.

ChrisE

Cheap plastic imitations of the quest artifact, which if presented to the quest leader fool them into thinking you completed the quest.

ChrisE

Ring of version control.

ChrisE

Morning stars only work during the morning.

ChrisE

You can lose your sense of smell, which blocks smell-related messages.

Wooble

Exciting spellbook that gives sleep resistance while reading it. Counterpart to the dull spellbook.

Wooble

Gauntlets of force give you a ranged choking attack.

SporkHack

jonadab

You can set your character's gender to nonbinary, but the only effect is making you ineligible for both the male egg-hatching benefit and the female egg-laying benefit.

aosdict

Tylenol: prevents headaches from psi bolt for a short time. You get liver disease if you eat too much.

Luxidream, bug_sniper

Potion of vain ability: you act as if all your ability scores are at maximum even though they aren't to any outside observer.

aosdict

Rapper role, the main benefit of which is that you can wear 10 rings and 5 amulets.

aosdict

Magboots, which block flight, levitation, swimming, surprise teleports, levelports, and magic portals.

Tarmunora

Concussive gauntlets (possibly anachrononaut gear): add their enchantment to unarmed attack damage, very high chance of dealing staggering or weapon-shattering blows, allow punching through walls.

Tarmunora

If a barrow wight finds a ring of invisibility, it will put it on and transform into a Nazgul.

aosdict

New monster "gwawol", which is a G-class monster that behaves exactly like a gnome but is guaranteed to generate with a wand of lightning.

Grasshopper

Ice eye monster: gives a whole new meaning to being "frozen by a monster's gaze".

aosdict

Green slime corpses start sliming you when touched, and pyrolisk corpses burn your hands when touched.

LarienTelrunya

Potions of propane that create invisible and explosive clouds of propane gas.

aosdict

When polymorphed into an earth elemental, you can always press &gt; to descend to the next dungeon level.

LarienTelrunya

A sessile monster that harms the player when hit or killed and has no gameplay benefit at all - no experience, no corpse, no death-drop, nothing. Exists only to hurt players who want to kill everything.

aosdict, Luxidream

Steam vortex monsters, with a capital S. When one engulfs you, you need to make a micropayment to get DLC that allows you to escape. Alternatively, for something that could actually be done in-game, a vortex that scatters and loses your zorkmids.

aosdict, PavelB

Spell that decreases the weight of an item in inventory by some random amount. If the weight becomes 0 the item flies out of your inventory at the speed of light, never to be seen again. If it becomes negative, it turns into antimatter and annihilates you instantly.

oh6

Belt of belting. Wearing it gives you a damage bonus to unarmed or whip attacks.

AntiGulp

Amulet of Vendor, which allows you to #chat to other monsters to sell them things. Also, it tries to sell you things and give you advertisements.

AmyBSOD

Potion of endarkenment. Works like enlightenment, except everything it tells you is a lie.

aosdict

Monsters can learn over time to resist Elbereth.

aosdict

Amulet of unchanting. Autocurses when worn; blocks spellcasting.

aosdict

Praying mantis, a. When you reduce it to low HP it prays and becomes momentarily invincible before restoring to full health.

aosdict

Trap doors in the ceiling that hold monsters, which fall out when the trap is triggered.

Muad

Elves respect (and flee from) the name of Eärendil, but since you can't type diacritics into the game you can't engrave it.

aosdict

Demogrogon, who is not a threat because he just stumbles around confusedly and falls to the ground asleep.

aosdict

Chests of holding: apply the same weight reduction to their contents as bags of holding do, but still have the same base weight as a chest.

ChrisE

Your whole pack weighs nothing on the Plane of Air, because there is no gravity there.

aosdict

Random graves occasionally contain time capsules if the player is an Anachrononaut.

dNetHack

aosdict

Items found in a random grave are all flagged as "historic".

AntiGulp

Implement the Nac Mac Feegle from Discworld. They are n class monsters but are male, not female; they are very small and hit strongly. They have a MS_CRIVENS sound, which verbalizes "Crivens!" when you chat to them.

aosdict, AntiGulp

You can name the bugs on the floor.

ChrisE

Artifact weapon Bridgebane, which can destroy drawbridges and grants you immunity to death from drawbridges.

ChrisE

Polecorn: a unicorn whose horn is a polearm and which can attack you from polearm range.

AmyBSOD

The game is aware of your real birthdate. On your birthday, the Candelabrum requires your age's number in candles.

K2

Trip ration: when you step onto it, you trip over it and make a lot of noise.

aosdict

Add earworm as a w monster, with an amnesia attack.

aosdict

Cat carriers that you can use to transport Schroedinger's Cat through the Planes safely.

aosdict

You can attach one aklys to another aklys to produce nunchaku.

ChrisE

Floating-Eyed Sam.

ChrisE

Umber Archons, which confuse you with their gaze before blinding you with their gaze.

aosdict

Cursed stethoscopes weld to your ears, making you Deaf and unable to drop it until you can remove the curse.

aosdict

Dartboard terrain feature, which lets you throw darts at it to exercise dart skill, and the darts don't disappear in the process.

aosdict

When polyselfed into a d or f monster, the hero has intrinsic food appraisal.

Mandevil

Royal jelly as a monster, a j. It drops royal jelly objects when killed.

aosdict

Light iron ball. Like a heavy one but only weighing 15 aum or so.

aosdict

You can engrave Elbereth in the ceiling with a wand of fire, but it only scares wumpuses.

Luxidream

Humans have a bite attack which occasionally causes rabies.

rikersan

Nasty (probably boss-specific) artifact degrading attack. Only has an effect if you have an artifact in inventory; turns one artifact in inventory into its base item. Intelligent artifacts might resist.

aosdict

Vending machines that carry candy bars, fortune cookies, meat sticks, and seasonally appropriate named fruits.

jonadab

To pacify a nymph, light two candles and carry a bottle of booze while in the same room as her.

bouquet

As an XKCD reference, a female gnome will very rarely be generated with the name "Gnome Ann".

aosdict

Paci-fist monster who attacks the player with martial arts.

AmyBSOD

Handling a rust monster corpse with iron gloves will rust them, and kicking it with iron boots will rust them. Also, disenchanter corpses disenchant gear used the same way.

AmyBSOD

Shoe Event Horizon: Carrying too many shoes around eventually causes more and more random items to generate as shoes, until there are only shoes generated.

Chris_ANG

Artifact Magic Belt from the Oz books. Gives a wish when applied; can be applied as many times as you want.

aosdict

A Q-class monster with an attack that changes your gender.

Demo

Arrows fired from the Longbow of Diana explode.

aosdict

When you throw away a tin of meat from any T-class monster, a troll of that type spawns next to you.

greqrg

Scroll of Scheherazade: it forks and puts you into a new nethack game. If you win this game, you get a wish in the original one. Of course, within the new game you can find and read more of these scrolls...

AntiGulp

When you, polyed into a water elemental, get engulfed by another water elemental, you fuse into a giant water elemental with combined HP and inventories.

aosdict

If you can get a shopkeeper to inhale a potion of see invisible, they will no longer care if you're invisible.

Elronnd

Giant moth enemy that damages cloth items with its attack.

Vivit

When dgamelaunch detects that someone's spectating your game, you get the message "You feel like you are being watched."

aosdict

Jelly fountains.

ChrisE

A "spoopy ghost" monster that will scream "Boo!" and teleport away when it reaches you. If you fail some kind of a saving throw here, you are paralyzed as with a ghost from a milky potion.

Khor, AmyBSOD

Wands of debt.

ChrisE

Crutches that you can use when your legs are injured.

Wooble

A condenser that lets you collect the vapor from an evaporating overenchanted weapon.

ChrisE

Mail daemons ride thunderbirds.

aosdict

Make the spell list work like Pokemon: "You are trying to learn the spell 'jumping'. But, you can't learn more than four spells. Forget an old spell to make room for 'jumping'?"

aosdict

Chatting to any V-class monster on November 5 causes them to say "Remember, remember, the Fifth of November".

aosdict

Salads. Combine cockatrice, lizard, and lichen, dress with acid, and serve. It increases charisma, making you feel "statuesque".

attie

If you have illiterate conduct intact, the mail daemon delivers a singing telegram instead of a scroll of mail.

nooodle

You can eat your leg to escape from a bear trap. This causes permanent wounded legs.

attie

If you are zen, casting cure blindness cures your permanent blindness and breaks the conduct.

aosdict

Eating Fire Brand can give fire resistance.

Andrio

Merge the loadstone and heavy iron ball items, so that punishment has you drag around a loadstone chained to your leg.

aosdict

Scroll of bad jokes, which makes nearby monsters either peaceful or hostile based on your Charisma, and scroll of Vogon poetry, which causes pain to all hearing monsters and causes them to flee.

K2, aosdict

Boots of booting. They let you boot other players on the system or public server you are playing on out of the game.

AntiGulp

Dead-end corridors sometimes end in a secret door that leads nowhere.

AmyBSOD

Basic corpses, to counter out the acidic ones.

aosdict

Artifact weapon that creates a hole under anything it hits (assuming the floor is diggable), causing them to plunge into it.

aosdict

Artifact loadstone or boulder named "Sisyphus's Rock. On 10% of turns, it rolls in a random direction for 10+d10 spaces.

PavelB, aosdict

Caveman-specific alternate name for a knife: "thagomizer".

aosdict

In the Mines and other rocky/earthy levels, thrown daggers and darts and other piercing weapons can end up embedded in the wall.

aosdict

Spell of cause dread, which is more subtle and less direct than cause fear. Affected monsters will turn and flee much earlier than normal.

aosdict

Giants specifically cannot use small shields, and tiny or small monsters that attack them can only give them wounded legs instead of HP damage, and they cannot be decapitated by anything wielding Vorpal Blade if it isn't Large, and small or tiny monsters they kick are launched across the room.

aosdict, jonadab

Spell of burn undead.

bug_sniper

Dogs chew shoes they find on the floor, reducing their enchantment to a minimum of -2.

Guthix

When a bag of holding explodes, it wakes up the Wizard of Yendor, no matter where he or the hero is in the dungeon.

jonadab

Zapping stone to flesh at graffiti makes all the letters in it come to life.

carlarc

Yeast, or "methyst stones", which converts fruit juice to booze.

ChrisE

Dipping for Excalibur while confused will cause you to cut off the hand that reaches up from the murky depths.

aosdict

Fool's gold golem: looks identical to a gold golem and even displays as "gold golem" when farlooked, but has the stats and attacks of an iron golem.

aosdict

When a black dragon dies, it self-disintegrates, possibly releasing an area-of-effect disintegration blast.

jonadab

Monsters that have specific grudges against other types of monsters for which a bane exists can generate with that bane.

jonadab

You can #tip a wand to eject all of its remaining charges downwards at once.

ChrisE

Literal polearm: a pole with an arm attached to it. The arm can hold a weapon, which extends your melee range to two tiles.

PavelB

Polearm with a sling on the end, like a lacrosse stick. Can be used to throw sling-style ammo to greater distances than slings can.

aosdict

Whenever something uses a bullwhip to yank Stormbringer away from its wielder, it deliberately hits the yanker.

aosdict

Anti-gremlin that multiplies in lit squares, is instakilled by the darkness effect of the cursed scroll of light, and gives you intrinsics with its attack.

AmyBSOD, attie

Durian comestible item. When carried in inventory, it causes all monsters with noses to flee.

hothraxxa

You can #tip potions of (un)holy water out on the ground; this blesses/curses the topmost item sitting on your square.

attie

Trolls revive exactly 4 times (instead of a repeated 75% chance). Cats revive exactly 8 times.

carlarc, aosdict

Forcrist, an artifact that deals double damage to monsters stolen from other variants.

Luxidream

Potion of desperation: level teleports you to dungeon level 1, resets your experience level to 1, and destroys all of your items.

oh6

Wands that become (1:-1) cancel out and become (0:0).

aosdict

Fortune cookies with the message written in invisible ink. If you have see invisible, you read it normally.

aosdict

A frog monster that lays millions of eggs.

paxed

Artifact fumble boots, which sometimes cause you to trip and fall on top of tiny monsters, instakilling them.

PavelB

You can wish for a moon. This causes new-moon effects for the rest of the game.

ChrisE

Every pair of boots not generated on a monster may have a cave spider hidden inside, which pops out and attacks if you try to wear them.

Tangles

Artifact weapon Zombiebane: it deals double damage to all zombies and auto-tins their corpses when you kill them.

Demo

Amulet of time: you can read it to tell the time, and it provides +5 Charisma for its bling value.

Demo

Heavy armor skill. Enhancing it reduces penalties for to-hit, encumbrance and spellcasting. The only way to train it is by moving, fighting, and spellcasting in heavy armor.

Andrio

Diluting a potion of oil in a fountain or moat summons the Kops because you polluted the environment.

AmyBSOD

If you load a save that's over a week old, your character suffers amnesia.

jonathanhanes

You can apply an iron chain to a ring in order to get it back after you drop it down a sink.

PavelB

Bulkstones: they are mostly like loadstones, but are rather lightweight. Instead, they take up a lot of inventory slots.

bug_sniper

Giants can shoot boulders through a sling. Boulders shot this way may crash through the walls or the floor they hit.

AmyBSOD

Wand of create blindfold.

ChrisE

An intelligent pet with hands and carrying a leash can leash another of your pets nearby.

ChrisE

Wearing an amulet of change with polymorph control gives you the option of switching genders or not.

Elronnd

Rustbane, an artifact weapon that is always rustproof and does double damage to monsters that cause rust. It also removes rust from armor worn by monsters hit with it.

ChrisE

Bamboo trees, which show up exclusively on the Monk quest home level to provide set dressing.

Chris_ANG

Carrying stone, a stackable gray stone that modifies your carrying capacity by 25 if blessed, -25 if cursed, and 10 if uncursed. It weighs 10.

NeroOneTrueKing

Any random non-unique monster that wouldn't otherwise get a name has a 0.1% chance of getting a name pulled from petnames in players' config files.

jonadab

A chain of 25 nested sacks, which has a prize in the bottommost one.

Demo

Magicbone: an artifact tool that makes f and d become peaceful and follow you around when you wield it.

bouquet

Vaults can generate 4 sleeping leprechauns inside instead of 4 piles of gold.

riker

A Lakitu-like monster that can throw an infinite number of cockatrice eggs at the player.

AmyBSOD

If your luck is negative when you dip for Excalibur: "From the watery depths, a hand reaches up to confiscate your sword. You are hit by the blessed rustproof Excalibur!"

Hekik

Every level of Gehennom gives a random, usually unpleasant, status effect to all monsters that aren't on Moloch's side.

FIQ

A feline monster that throws rocks or boulders, called the Cat-apult. Also one that throws cats.

AntiGulp, Andrio

Scroll of absolute value. When read and given an item which is negatively enchanted, it flips it to the same magnitude but positive.

bouquet

Writing "Vlad was here" in the dust creates a trapdoor.

ChrisE

Alethiometers. Applying one gives you a true rumor translated into a series of vague symbols.

Wooble

A pickup_throne option which picks up thrones.

ChrisE

A monster that occasionally swaps position with the player, from anywhere on the level.

jonadab

If Magicbane catches a curse when you are playing in the tty interface, the game automatically switches into the curses interface.

AmyBSOD

Very strong players can pick up stairs and place them somewhere else.

ChrisE

Transactions that involve handing over more than 500 zorkmids take 1 turn per 500 zorkmids handed over, rounding up. If your Intelligence is lower than 10, you may either overpay or shortchange by mistake, and shortchanging makes the other person angry.

AmyBSOD

Allow the player to change the gender option in-game, but only if they have an identified amulet of change in open inventory which will be used up in the process.

AmyBSOD

Historic statues render as the "historic" ` symbol.

ChrisE

A tameable monster called a peeve.

ChrisE

Eating a candy bar may return you to your normal form when polymorphed, as a reference to Snickers "You're not you when you're hungry!" ads.

Hekik

Soldier ants wield submachine guns. Why do you think they're called soldier ants?

aosdict, AntiGulp

Getting smited by your god counts as a religious experience, giving you a few experience points.

aosdict

When sacrificing to an angry god, they may give you a gift of an item that is named the same as an artifact but a different type and cursed and negatively enchanted. This counts as a gift for future gifting purposes.

riker

Allow the player to read labels on identified potions of booze.

aosdict

Weapon object property 'chaotic' which causes it to act like it has a random property on each hit.

riker

Boomerange, which is like a boomerang but has a controllable range.

riker

A stamp item that turns any armor item it is applied into some type of mail.

Mttn

Monsters try to quaff fountains for a wish. They usually die to snakes, but will keep trying anyway.

bug_sniper

#sorry command to pacify monsters you have angered.

AmyBSOD

Dingbats, which behave like bats but render in strange non-ascii glyphs, carry bells, and occasionally make 'ding' sounds.

AntiGulp

If you're wearing gauntlets of dexterity you can put on or take off any and all armor items in one move.

hothraxxa

Spawn some steam vortices in when the geyser spell gets cast.

aosdict

Combined Planes levels. Fire + Water = steamy calderas, Earth + Air = sandstorm, etc.

Demo, aosdict

Dipping high boots into potions of oil turns them into fumble boots.

bug_sniper

Stone to fleshing an altar creates a meat altar to the Lizard God. Stone to fleshing a wall creates a wall of flesh, which is easier to dig through.

bug_sniper

Unskilled casters of summon insects only generate grid bugs.

aosdict

Potion of addiction: when you drink it, you have a limited amount of time to find and drink another before going through severe withdrawal. Monsters that drink it will violently search out other potions.

bug_sniper, AntiVirus

Uranium wands can cause radiation burns if kept in open inventory.

K2

Armor made of depleted uranium; grants 90% damage reduction but is incredibly heavy.

K2

Sensory deprivation helmet which blocks ESP, sight, and hearing.

AntiGulp

If a genie gives you a wish, wishing for "a friend" tames the genie.

vivit

Sunsword has infinite light radius, but rapidly makes you go permanently blind.

Wooble

The only wishes that water demons can grant are ones for potions of water.

ChrisE

Implement banshees. Banshees' wail breaks glass. All glass in a large radius no matter where it is.

aosdict

Hitting plant-class monsters with Sunsword heals them. If the monster is a sunflower, it clones it.

dNetHack

rikersan

Mitres (bishop/pope hats) as a common item. They have a base AC of 0 but make it less likely that your god is displeased when you pray.

aosdict

If you are standing on your high altar with the Amulet of Yendor, you can press &lt; to ascend.

AmyBSOD

Water waking boots, which create water elementals when immersed in water.

AntiGulp

Chromatic dragon scales can be obtained by polypiling a pile of every single color of dragon scales, which creates a chromatic dragon with nine times as much HP as a standard dragon, a random breath attack, and many random claw and bite attacks. When it dies it drops its chromatic scales.

rikersan, aosdict

The ability to #tip the contents of one container into another.

AntiGulp

Half-elf race, which turns into an elf during full moons and a human during new moons.

aosdict

Eating Trollsbane confers intrinsic life saving.

AntiGulp

New 'tin' weapon skill, which boosts your accuracy and damage for throwing tins at monsters.

AmyBSOD

You can use a blessed touchstone to identify gemstone ring types.

rikersan

A Big Room variant where you start in an enclosed cage in the middle of the map with a ring of conflict, and on opposite sides are two groups of monsters all from the same glyph.

Umby

Leaving a level with a shop for a long time can result in some of the items scattered around on the floor being mysteriously gathered up and placed into the shopkeeper's inventory, possibly one for each space in the shop with nothing on it.

AntiGulp

Watchmen actively repair town walls, and get angry at any creature they see damaging walls.

Umby

Monks who are a "Student of [element]" exercise wisdom by doing things related to that element.

FIQ

Dwarves always drink golden potions regardless of what they are.

Umby

Berserker conduct, a game mode which enforces killing every monster in sight.

K2

Extend the monster-photography patch to be able to take selfies with monsters.

aosdict

Altars with cushions on them so if you drop things on it without realizing you're levitating, it doesn't break. Also, if you are dropping items while levitating and there is a soft item in the pile on the floor, dropped items don't break.

ChrisE, Wooble

New "Paranoid" status effect. You gain warning, but everything shows as warning level 5.

Hekik

Dwarven helms make you immune to damage from falling objects because they are "hard hats" when unidentified.

aosdict

Digging, destroying doors, and using scrolls of earth may cause a health and safety inspector to appear and complain that you aren't wearing iron boots and a hard hat and a mummy wrapping for visibility.

ChrisE

Potion of alkali to counteract the potion of acid.

ChrisE

Implement an automagnet like many other games have; gold and items lying on the floor get magically sucked into your inventory from a couple spaces away.

aosdict

Endermen, which generate peaceful but anger if you gaze attack them or farlook them.

Andrio

If you eat too many enchanted rings for too high of a charge, you explode.

aosdict

Detect food also detects monsters that can leave a corpse, since they are potential food.

aosdict

Detonating boomerangs.

jonadab

Use a counter to track how many "effective wishes" have been generated through the whole course of the game (a magic lamp 1, a 0:2 wand of wishing 6). The counter also ticks up when you get a wish from another source. It ticks down when you "lose" a wish somehow, such as a blessed magic lamp failing to produce a wish. When the counter is high, wishing items generate less frequently (the counter ticks down when a wishing item fails to generate because the counter is too high).

NeroOneTrueKing

Reviving monsters (trolls, zombies in some variants) cannot revive if they are killed in ways that thematically should prevent them from reviving, such as being killed with fire.

NeroOneTrueKing

Role whose quest artifact's base type is a helm of opposite alignment.

jonathanhanes

If you are polyselfed into a demon, you might at any moment get whisked off to some combat scene in Gehennom via demon gating.

jonathanhanes

Icebox of holding. It reduces the weight of corpses stowed inside it, but the container itself still weighs 900.

jonathanhanes, aosdict

You can offer booze on altars.

rikersan

A library that allows you to borrow spellbooks for a certain number of turns, but if you are tardy in returning it you get harassed by a Rodney-like angry librarian.

Demo

Magic wishile, a spell that grants the monster it hits a wish. Costs 300 Pw to cast and only works on intelligent hostile monsters.

rikersan

Low level tourists (Roamers) receive large mobile phone bills.

ChrisE

Incense candles, they don't give off as much light as a regular candle but they smell nice.

ChrisE

If you move onto an upstairs when levitating and burdened, you tumble up the flight of stairs and take the same amount of damage as tumbling down does.

aosdict

The Really Cool Shirt is so cool, it can't be hit with a curse items effect.

TNNT

aosdict

Intelligent spellcasters that see you wielding a cockatrice corpse will specifically target your gloves with the destroy armor spell.

aosdict

Detect when a death was caused by a pet not getting out of the way and append "while blocked by a pet" to the death message.

Andrio

English teachers whose attack deals no damage, but breaks your illiterate conduct.

bug_sniper

Loadstones, being made of lead, can be turned into gold by doing alchemy (dipping them in potions).

AntiVirus, jonadab

Add glass shard items, which deal d6 damage and wounded legs to anyone who steps over them without shoes on.

Andrio

Implement a Pokemon shinies rule. 1 out of every 8192 monsters will render as a random different color than normal, which has no purpose except to confuse you.

aosdict

Evil chests that you can put items into, but will become hostile and attack if you try to remove one.

rikersan

Fortune cookies act as luckitems.

AntiGulp

A troll bisected with the Tsurugi splits into two trolls.

AntiGulp

If you ascended the last two games, the Minetown Watch consider you a streaker and generate hostile.

Andrio

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