His first move is using Gravity Manip to lay down forcefully the opponent, then from under the opponent, if they don't jump in time, they'll be stabbed from "bone-blades", if that doesen't work, he'll summon dozen of flying blaster he can controll with thought that will shoot lasers towars them.
And after this, he'll costantly spam attacks that are a combination of what I said, with even launching the bone-blades from nothing against the opponent, and all his attack damage the SOUL too, and the damage is directly proportional to how much the opponent killed, to the point that it would almost instantly one-shot a guy that killed thousands despite him was like 50 times more powerful.