Arcane Heart

You withdraw the pure elemental energy, also known as an Elemental Soul, from a living creature's body as a ritual, and place its Elemental Soul in a new vessel, transforming the corresponding Elemental Essence used in the casting of the spell into an Elemental Heart. The targeted creature must be willing or unconscious and remains unconscious for as long as you maintain concentration. If you maintain concentration for the full duration of the spell, the spell is successful. If not, the targeted creature awakens, gains the benefit of a long rest, and becomes hostile towards you, if it was an unwilling target.