Incorruptible Vessel. The exorcist can't be possessed by Celestials, Fiends, or Undead.

Spellcasting. The exorcist casts one of the following spells, requiring no material components and using Intelligence as the spellcasting ability (spell save DC 14, +6 to hit with spell attacks):

At will: detect evil and good, mage armor (self only), mage hand

1/day each: banishment, dispel evil and good

2/day each: protection from evil and good, remove curse, speak with dead

Multiattack. The exorcist makes two Grave Burst attacks.

Grave Burst. Melee or Ranged Spell Attack: +6 to hit, reach 5 ft. or range 120 ft., one target. Hit:19 (3d10 + 3) necrotic or radiant damage (exorcist's choice).

Admit Entity (Recharge 5–6). The exorcist thins the veil of death for a creature it can see within 60 feet of itself, exposing the target to malevolent entities. The target must make a DC 14 Charisma saving throw. On a failed save, the target takes 36 (8d8) psychic damage and has the incapacitated condition for 1 minute, during which time it retches and babbles incoherently in a voice that is not its own. On a successful save, the target takes half as much damage only. An incapacitated target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.