Armor Class
12 + the spell's level
Fiendish Spirit
Large Fiend · Neutral
Hit Points
50 (Demon only) or 40 (Devil only) or 60 (Yugoloth only) + 15 for each spell level above 6
Speed
Walk 40 ft., Climb 40 ft. ((Demon only)), Fly 60 ft. ((Devil only))
CR
—
Traits
Death Throes (Demon Only)
When the spirit drops to 0 Hit Points or the spell ends, the spirit explodes. DEX Save DC equals your spell save DC, each creature in a 10-foot Emanation originating from the spirit.
Failure: plus this spell's level Fire damage.
Success: Half damage.
Failure: plus this spell's level Fire damage.
FireSuccess: Half damage.
Devil's Sight (Devil Only)
Magical Darkness doesn't impede the spirit's Darkvision.
Magic Resistance
The spirit has Advantage on saving throws against spells and other magical effects.
Actions
Multiattack
The spirit makes a number of attacks equal to half this spell's level (round down).
Bite (Demon Only)
Melee Attack Bonus Equals Your Spell Attack Modifier, reach 5 ft. + summonSpellLevel Necrotic damage.
NecroticClaws (Yugoloth Only)
Melee Attack Bonus Equals Your Spell Attack Modifier, reach 5 ft. + summonSpellLevel Slashing damage. Immediately after the attack hits or misses, the spirit can teleport up to 30 feet to an unoccupied space it can see.
SlashingFiery Strike (Devil Only)
Melee or Ranged Attack Bonus Equals Your Spell Attack Modifier, reach 5 ft. or range 150 ft. + summonSpellLevel Fire damage.