Call of the Void: 自分 calls 相手 to join them in nonexistence & become nonexistant together. Nonexistant: 自分 doesn't exist, but even thay simple fact is ignored as 相手's mortal mind cannot comprehend that so 相手's mind fills in that nonexistance as an "existent inanimate figure calling 相手". Having a mortal mind would ultimately be 相手's own weakness as they let themselves be nonexistant.