Lasher is a spirit that Suzanne calls out of chaos. He is a storm-maker. He can bring small objects to the witch who commands him. He engenders loyalty in the witches with his pact. He promises to do their bidding if they promise to have a daughter to whom to pass on the powers and the legacy. He turns out to be the spirit of a long-dead person, ambitiously seeking a way to be brought back to life. He predicts that the thirteenth witch will be strong enough (and have the knowledge) to help him. He kills through trickery to suit his purposes. He takes Rowan's baby from her womb and merges his microscopic cells with it to become a man again.