For the elite version, see Unspeakable horror (elite).
[FAQ] • [doc]
Unspeakable horror icon
An unspeakable horror is a Slayer monster found in the north-eastern part of the Mos Le'Harmless caves. The player requires level 58 Slayer, a witchwood icon, and a light source to successfully hunt and kill them. Completion of the Cabin Fever quest is required to access Mos Le'Harmless. Despite having the same Slayer level requirement, they are much stronger than the cave horrors found in the rest of the cave.

Players can buy a witchwood icon from any Slayer Master and must wear it while fighting horrors in close combat. The player can damage them without the icon, but the icon protects against the horrors' scream. Without the icon, the scream reduces stats and life points, similar to the effect of a banshee when fought without earmuffs or a dust devil when fought without a face mask. The deflect melee and protect from melee prayers will not block this damage.

These monsters are aggressive, regardless of combat level. They become docile after 5-10 minutes of staying in the vicinity of the monsters, which can be reset by running out of the area, then returning.


Mos Le'Harmless caves - in a cave on the southeast side of the island. Players need a light source (such as seer's headband 4 or a bullseye lantern) to operate in the cave. If a player goes in without a light source, bugs will rapidly bite them hitting 10-100 and can kill the player quickly depending on their number of life points.

Getting there

  • Using the charter ship.
  • Using the Big Book o' Piracy option 1, a reward from the quest Pieces of Hate.
  • Teleporting using rum (red) or rum (blue) bought from Honest Jimmy's House of Stuff.
  • Accessing through the fairy ring DIP (requires Fairy Tale III). If using the fairy ring shortcut, the player must first repair the bridges connecting the fairy ring island to the Mos le'Harmless mainland. This will require a total of 8 regular planks and 16 nails of any kind. Each bridge must be repaired from a different side, meaning the player must fix it from the Mos Le'Harmless side as well as the fairy ring island side if it is the first time using the shortcut).


100% drop

Item Quantity Rarity GE price
Big bonesBig bones1Always185


No charmGold charmGreen charmCrimson charmBlue charm
Represents a 90% confidence range based on a sample of 5,230 kills.
1 charm is dropped at a time.
Add data to the log (requires JavaScript).

Main drop

Item Quantity Rarity GE price
Coins 10000Coins2,351–12,488Common2,351–12,488
Teak logsTeak logs7–13 (noted)Common630–1,170
Mahogany logsMahogany logs3–7 (noted)Uncommon1,002–2,338
Monkey bonesMonkey bones(noted)Common444
Raw swordfishRaw swordfish4–12 (noted)Common1,736–5,208
Big bonesBig bones22–28 (noted)Common4,070–5,180
Weapon poison+ (3)Weapon poison+ (3)1Common1,202
Grimy ranarrGrimy ranarr(noted)Uncommon6,318
Grimy dwarf weedGrimy dwarf weed(noted)Rare18,982
Grimy lantadymeGrimy lantadyme(noted)Rare19,172
Poison ivy berriesPoison ivy berries(noted)Uncommon5,868
Ruby ringRuby ring4–6 (noted)Uncommon7,276–10,914
Ruby necklaceRuby necklace3–5 (noted)Uncommon6,711–11,185
Rare drop tableRare drop table1RareNot sold
Black mask (10)Black mask (10)1Very rare1,564,276

Tertiary drops

Item Quantity Rarity GE price
Scare TacticsScare Tactics1Rare413,707
Festering journalFestering journal1UncommonNot sold
Spirit sapphireSpirit sapphire1RareNot sold
Spirit emeraldSpirit emerald1RareNot sold
Spirit rubySpirit ruby1RareNot sold
Long boneLong bone1RareNot sold
Starved ancient effigyStarved ancient effigy1Very rareNot sold
Curved boneCurved bone1Very rareNot sold

Rare drop table

This monster has access to the rare drop table.
Show/hide rare drop table
Item Quantity Rarity GE price
Coins 250Coins250–500Common250–500
Uncut sapphireUncut sapphire1Common434
Uncut emeraldUncut emerald1Common743
Uncut rubyUncut ruby1Common1,320
Uncut diamondUncut diamond1Common2,694
Uncut diamondUncut diamond45–55 (noted)Rare121,230–148,170
Loop half of a keyLoop half of a key1Common11,513
Tooth half of a keyTooth half of a key1Common15,089
Uncut dragonstoneUncut dragonstone1Uncommon12,332
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare554,940–678,260
Dragon longswordDragon longsword1Common58,144
Dragon spearDragon spear1Rare36,765
BattlestaffBattlestaff180–220 (noted)Rare603,360–737,440
Rune javelinRune javelin5Rare915
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,213
Dragon helmDragon helm1Uncommon59,018
Rune arrowheads 5Rune arrowheads113–137Common14,125–17,125
Onyx bolts 5Onyx bolts135–165Very rare1,047,600–1,280,400
Chaos talismanChaos talisman1Rare1,456
Nature talismanNature talisman1Rare1,249
Water talismanWater talisman65–82 (noted)Rare196,300–247,640
Earth talismanEarth talisman65–82 (noted)Rare12,480–15,744
Fire talismanFire talisman25–35 (noted)Rare7,900–11,060
Raw lobsterRaw lobster135–165 (noted)Common78,705–96,195
Raw sharkRaw shark225–275 (noted)Uncommon248,400–303,600
Big bonesBig bones68–82 (noted)Uncommon12,580–15,170
Dragon bonesDragon bones180–220 (noted)Rare408,600–499,400
CoalCoal200–1,100 (noted)Uncommon24,400–134,200
Gold oreGold ore90–110 (noted)Common33,660–41,140
Adamantite oreAdamantite ore180–220 (noted)Uncommon42,660–52,140
Adamant barAdamant bar14–16 (noted)Common21,434–24,496
Adamant barAdamant bar135–165 (noted)Rare206,685–252,615
Runite oreRunite ore90–110 (noted)Rare79,560–97,240
Rune barRune bar(noted)Common6,165
Rune barRune bar45–55 (noted)Rare92,475–113,025
Grimy torstolGrimy torstol90–110 (noted)Uncommon670,500–819,500
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon166,500–203,500
Super restore (4)Super restore (4)45–55 (noted)Uncommon149,715–182,985
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon170,370–208,230
Lantadyme seed 5Lantadyme seed14–16Uncommon36,862–42,128
Dwarf weed seed 5Dwarf weed seed14–16Uncommon20,622–23,568
Magic seed 5Magic seed4Uncommon363,508
Palm tree seed 5Palm tree seed10Rare839,040
FlaxFlax450–550 (noted)Common42,300–51,700
Molten glassMolten glass45–55 (noted)Common13,905–16,995
Soft claySoft clay450–550 (noted)Uncommon227,250–277,750
Yew logsYew logs68–82 (noted)Uncommon13,532–16,318
Yew logsYew logs675–825 (noted)Rare134,325–164,175
Teak plankTeak plank45–55 (noted)Uncommon14,175–17,325
Mahogany plankMahogany plank270–330 (noted)Rare228,150–278,850
Blurberry SpecialBlurberry Special1Uncommon14,775
Vecna skullVecna skull1Very rare*96,580
Crystal triskelion fragment 1Crystal triskelion fragment 11Very rareNot sold
Crystal triskelion fragment 2Crystal triskelion fragment 21Very rareNot sold
Crystal triskelion fragment 3Crystal triskelion fragment 31Very rareNot sold

Universal drops

Universal drops are dropped by nearly every monster outside of Daemonheim.
These drops are dropped alongside main drops.
Item Quantity Rarity GE price
Key tokenKey token1RareNot sold
Mimic kill tokenMimic kill token1Very rare6,874