Channel Spirit (5e)

You perform a ritual to invite a dead creature's soul into your body. To channel a person's soul, you must know their name and what they look like. When channeling a spirit, your features subtly shift to fit those of the soul occupying your body, and they may use your mouth to speak. While inhabiting your body, you may communicate telepathically with the soul inhabiting your body. Other people can ask the soul questions regarding present or future events, or for more specific guidance concerning a problem. The soul is under no obligation to answer any questions truthfully. While your body is occupied, you gain the skills and proficiencies the creature had in life.

During this spell, the soul may attempt to posses your body. The soul must make a charisma roll against your spell save DC. On a successful roll, the soul takes full control over your body for the remainder of the ritual and you can no longer end the ritual by choice, after which, you have no memory of what they were using your body to do. During this time, the soul controls your body as if you were under the effects of a ghost's possession.