Call spirits

If there are any spirits within 15 feet of the user, they will be revealed to the user. If the user has cast a spell to create an artificial body, they may transfer a a revealed spirit into the body. You require an artificial body to use a spirit. The spirit must roll 1d20 constitution savings throw and get a 16 or higher to successfully resist being forced into the body. If the spirit successfully resists being forced into the vessel, the user will take 1d4 damage. If failed, the spirit will be forced into the artificial body, powering it. If a spirit is willing, however, no rolls must be made, and you are able to decide as to whether you concentrate on keeping it in. If you choose not to force it to remain in the body after it has willingly entered, it will be able to leave when it chooses to. Every 6 minutes, they may make a  1d20 constitution savings throw and get a 15 or higher to successfully escape the user's hold.