Exorcism

You attempt to expel a metaphysical entity from the creature it is possessing or a creature under the entity’s control. If the possessed creature was a willing host, the exorcism automatically fails. Otherwise, concentration must be maintained for at least one hour, during which time the caster must succeed on ability checks contested by the entity. If the entity’s name is known and invoked, it will have disadvantaged on all checks. The entity will attempt to use strength, charisma, intelligence, wisdom, dexterity, and constitution to break the caster’s concentration, using one ability every ten minutes. The nature of these attempts is described by the DM, but if the caster fails a check against the entity, the one hour timer is reset. For every reset, the caster gains one level of exhaustion. If the caster succeeds on every check, the entity is expelled from the host. If multiple creatures are casting this spell simultaneously on the same possessed creature, only one of the casters needs to succeed on an ability check.