#Dungeon23 Tomb of the Vampire Queen, Level 12, Room 14

 This section of the larger area is the home to the graves of many horses. 

There are Undead Horses and Nightmares here.

Undead Horses

Armor Class 7 [12]
Hit Dice 4 (18hp)
Attacks 2 × hoof (1d6+1)
THAC0 16 [+3]
Movement 120’ (40’)
Saving Throws D10 W11 P12 B13 S14 (4)
Morale 12
Alignment Chaos
XP 125
Number Appearing 1d8 (1d8)
Treasure Type None

Undead horses are skeletal remains of normal horses. They attack much as they did in life, only now they can also be turned as Wights.

Nightmares

Armor Class -4 [24]
Hit Dice 6+6 (33hp)
Attacks 1 bite (2d4), 2 × burning hooves (2d4+2); Breath smoke
THAC0 14 [+5]
Movement 150’ (50’) / Fly 360' (90')
Saving Throws D10 W11 P12 B13 S14 (4)
Morale 12
Alignment Chaos
XP 1,025
Number Appearing 1 (1)
Treasure Type None

Nightmares are the steeds of night hags and other demons, black horses with flaming hoofs and mane. Their breath is a cloud of brimstone smoke, which causes any nearby opponent to attack at –2 (saving throw applies). These horrible creatures can become incorporeal and travel between the planes of existence, bearing their evil/chaotic riders.

(Section 15: Nightmare, Swords & Wizardry SRD)

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Again, GMs choose as many as they need to challenge the PCs.