Exorcism

You attempt to expel a possessing entity from a creature. Make a melee spell attack against the possessed creature. On a hit, the possessing entity must succeed on a Charisma saving throw or be forced out of the creature it is possessing, appearing in an unoccupied space within 10 feet of it.

While the entity is expelled, the creature it was possessing gains advantage on saving throws against being possessed again and gains temporary hit points equal to your spellcasting ability modifier at the start of each of its turns. These temporary hit points last until the spell ends.

If the possessing entity fails its saving throw by 5 or more, it is banished to its plane of origin and cannot return to the Material Plane for 24 hours.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the banishment duration increases by 1 day for each slot level above 3rd.