FREQUENCY: Very rare ([Cold Wilderness Mountains])
FREQUENCY: Very rare ([Temperate Wilderness Mountains])
FREQUENCY: Very rare ([Tropical Wilderness Mountains])
FREQUENCY: Very rare ([Dungeon Level VI])
FREQUENCY: Common ([Astral Plane])
FREQUENCY: Common ([Ethereal Plane])

NO. APPEARING: 1 <anti-paladin>
ARMOR CLASS: -4
MOVE: 15"/36" <MC=?> <Aerial Mount Data, Dragon #50>
HIT DICE: 6 + 6
% IN LAIR: Nil
TREASURE TYPE: Nil
NO. OF ATTACKS: 3 ~ 13
DAMAGE/ATTACK: 2-8/4-10/4-10
SPECIAL ATTACKS: Nil
SPECIAL DEFENSES: Smoke cloud (-2 on opponent "to hit" and damage)
INTELLIGENCE: High
ALIGNMENT: Neutral (evil)
SIZE: L
LEVEL/X.P. VALUE: VI | 600 + 8 <36 hp = 888>

SAVES: 10.11.12.12.13

Also known as "demonhorses" && "hellhorses," nightmares are creatures from the lower planes.
They are ridden primarily by the more powerful demons && devils as well as by night hags.
On occasion they serve as steeds for undead such as spectres, vampires && liches.

The nightmare attacks with its great fangs as well as its burning hooves. <compare: produce flame / produce fire>

Smoke cloud: These creatures breathe out a smoking, hot cloud during combat, <infravision>
and it obscures vision by blinding the eyes and choking its opponent. <compare to some of the smoke spells, e.g. pyrotechnics, as well, effects of smoke in the DSG>
Unless a save is made the opponent attacks at -2 "to hit" && damage dice.

Nightmares can fly, become ethereal <(ethereality)>, and roam the astral plane. <{}?>
They {hate} material life and attack viciously, <no TALK>
even without a rider to {command} them.

Description: The hell horse is gaunt && skeletal with a huge head,
glowing red eyes,
flaming orange nostrils,
and hooves which burn like embers. <as tinderbox?>
The coat is dead black, and the creature's mane and tail are wild && rugged.

The nightmare is the sacred animal of Hades.

<Nightmare, original color image>

<Nightmare: These creatures, originating from the lower planes
and being very intelligent, may demand human or demi-human
sacrifices to themselves on a regular basis. The nature of such
sacrifices may vary widely. Otherwise, Nightmares are carnivorous, and seem to prefer the meat of some of the lesser
demons and devils (particularly manes and lemures). The failure of its master to provide such nourishment may (40% chance)
result in the creature becoming hostile unless the Nightmare
gets this particular type of meat at least once per month.>

<Lords of Darkness [3e] image instead, maybe>
<great image, but head is not huge enough, body is not skeletal enough>