Armor Class
12 + the level of the spell (natural armor)
Fiendish Spirit
Large Fiend · Unaligned
Hit Points
50 (Demon only) or 40 (Devil only) or 60 (Yugoloth only) + 15 for each spell level above 6th
Speed
Walk 40 ft., Climb 40 ft. ((demon only)), Fly 60 ft. ((devil only))
CR
—
Traits
Magic Resistance
The fiend has advantage on saving throws against spells and other magical effects.
Death Throes (Demon Only)
When the fiend drops to 0 hit points or the spell ends, the fiend explodes, and each creature within 10 feet of it must make a Dexterity saving throw against your spell save DC. A creature takes + summonSpellLevel Fire damage on a failed save, or half as much damage on a successful one.
FireDevil's Sight (Devil Only)
Magical darkness doesn't impede the fiend's darkvision.
Actions
Multiattack
The fiend makes a number of attacks equal to half this spell's level (rounded down).
Bite (Demon Only)
Melee Weapon Attack your spell attack modifier to hit, reach 5 ft., one target. + summonSpellLevel Necrotic damage.
NecroticClaws (Yugoloth Only)
Melee Weapon Attack your spell attack modifier to hit, reach 5 ft., one target. + summonSpellLevel Slashing damage. Immediately after the attack hits or misses, the fiend can magically teleport up to 30 feet to an unoccupied space it can see.
SlashingHurl Flame (Devil Only)
Ranged Spell Attack your spell attack modifier to hit, range 150 ft., one target. + summonSpellLevel Fire damage. If the target is a flammable object that isn't being worn or carried, it also catches fire.