Originally from Antibirth, appears to be functioning in repentance, however they will not spawn naturally, spawns Lil' haunts from souls info from antibirth wiki:
Exorcists behave similarly to Necromancers but exclusively spawn ghost enemies (with the exceptions of Red Ghosts and Nightwatches) regardless of any enemies being killed. In the boss fight against The Heretic, 5 Exorcists are seen summoning him before turning into Fanatics.

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