Ritual Exorcism
System: Pathfinder | SRD
Level: 4
School: abjuration
Casting time: 40 minutes
Components: V, S, M (vial of holy water), F (silver holy symbol), SC (up to 12)
Skill checks: Knowledge (religion) DC 28, 2 successes; Spellcraft DC 28, 2 successes
Range: close
Duration: instantaneous
Saving throw: Will negates
Spell resistance: yes
Backlash: All casters become exhausted.
Failure: All casters gain 1 temporary negative level (DC = 16 + primary caster’s Charisma bonus to remove after the first day), and the primary caster takes 4d6 points of damage.
You force the life force of a possessing creature to leave its host. Upon the completion of this ritual, the possessing creature attempts a Will saving throw. If it fails the save, the possessor is expelled, as if the duration of the spell or effect it used to possess the target had expired. If the possessing creature succeeds at the save, it continues to stay within the host creature or object, though the ritual can be attempted anew as long as the possessed creature is helpless or the object restrained.
Source: Occult Adventures pg. 212