Soul stealing

Soul stealing is the ability to remove the souls from the bodies of others.

Scáthach (American Horror Story)
Scáthach has the magical ability to control others by stealing their souls, performed via a ceremony. She used this power to control both the Butcher and Lee Harris, forcing them to eat a boar heart that epitomized the dispensation of their free will. Any injuries inflicted upon the recipients prior to them consuming the heart appear to be healed after this, as Lee seemed invincible despite her scarred leg.