Nightmare
Large fiend, neutral evil
Armor Class 13 (natural armor)
Hit Points 68 (8d10 + 24)
Speed 60 ft., fly 90 ft. (hover), swim 30 ft., climb 30 ft.
str
18 (+4)
dex
15 (+2)
con
16 (+3)
int
10 (+0)
wis
13 (+1)
cha
15 (+2)
Damage Immunities fire
Senses passive Perception 11
Languages Understands Abyssal, Common, And Infernal but can't speak
Challenge 3 (700 XP)
Confer Fire Resistance. The nightmare can grant Resistance to Fire damage to a rider while it is on the nightmare.
Illumination. The nightmare sheds Bright Light in a 10-foot radius and Dim Light for an additional 10 feet.
Actions
Ethereal Stride. The nightmare and up to three willing creatures within 5 feet of it teleport to the Ethereal Plane from the Material Plane or vice versa.
Hooves. Melee Attack Roll: +6, reach 5 ft. 13 (2d8 + 4) Bludgeoning damage plus 10 (3d6) Fire damage.