# Nightmare

u Nightmare 

Difficulty

17

Attacks

Head butt 3d12, Kick 3d6

u Nightmare 

Difficulty

17

Attacks

Head butt 3d12, Kick 3d6

Base level

12

Base experience

386

Speed

24

Base AC

-2

Base MR

70

Alignment

15 (lawful)

Frequency (by normal means)

Unique

Genocidable

No

Weight

1500

Nutritional value

300

Size

Large

Resistances

poison, fire, cold, electricity

Resistances conveyed

None

Nightmare:

 has no hands.

 is an animal.

 is herbivorous.

 is not a valid polymorphable form.

 is female.

 is normally generated hostile.

 wanders randomly.
 can follow you to other levels.
 is nasty.
 is strong.

 wants the Amulet of Yendor, the Bell of Opening, the Book of the Dead, the Candelabrum of Invocation, and your quest artifact.

 never leaves a corpse.

 hits creatures as a +2 weapon.

Reference

SLASH'EM_0.0.7E7F2/monst.c#line4568

Nightmare is a monster added in SLASH'EM. She is the Lawful Quest nemesis, and will leave the Key of Law when killed and Nighthorn if killed in a way that would leave a corpse - Nightmare will never leave a corpse, instead simply producing Nighthorn and the message "All that remains is her horn...". Like all alignment quest nemeses, Nightmare is covetous and will teleport to your position once awakened. Nighthorn is not strictly a unicorn, and thus will not accept gems nor use her horn to heal herself. As Nighthorn grants reflection, Nightmare herself has reflection and all beams will reflect off of her horn.
Nightmare is also found in the dNetHack Chaos Quest, with slight changes.  She is now a black (chaotic) unicorn, and will be peaceful to chaotics.  If they want the slightly modified horn, they'll have to take the -5 penalty for killing a coaligned unicorn.  See the Nighthorn article for more.