Nightmare

5e compatible shield

Large fiend, neutral evil

Armor Class 13 (natural armor)
Hit Points 68 (8d10 + 24)
Speed 60 ft., fly 90 ft.

STR DEX CON INT WIS CHA
18 (+4) 15 (+2) 16 (+3) 10 (+0) 13 (+1) 15 (+2)

Saving Throws 
Skills 
Damage Resistances 
Damage Immunities fire
Condition Immunities 
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 anyone riding it.

Illumination. The nightmare sheds bright light in a 10- foot radius and dim light for an additional 10 feet.

Actions

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage plus 7 (2d6) fire damage.

Ethereal Stride. The nightmare and up to three willing creatures within 5 feet of it magically enter the Ethereal Plane from the Material Plane, or vice versa.