Nightmare

Large fiend, neutral evil

Armor Class: 13 (natural armor)
Hit Points: 68 (8d10+24)
Speed: 60 ft., fly 90 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)
Proficiency Bonus: +2

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.

How many for your party

Copies of the nightmare (700 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Nightmare for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 2	—	—	1	2–20
Level 3	—	1	—	2–20
Level 5	—	2	3	4–20
Level 6	2	—	3	4–20
Level 7	2	3	4	5–20
Level 8	2	3	4–5	6–20

In these lists

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Questions

What CR is the Nightmare?

The Nightmare is challenge 3, worth 700 XP, with a proficiency bonus of +2.

How many hit points does the Nightmare have?

68 hit points (8d10+24), with AC 13 from natural armor.

How many should I use against four 2nd-level characters?

Against four level 2 characters, 1 is hard by the encounter XP budget.