Maxwell is a child with a notebook that can do anything. Literally. Creating a evil murderous giant fat immortal omnipotent invincible living milkshake? EASY! Also, when he writes all of time freezes. Not even immortal gods are immune to his book, literally, he can easily solo a verse that's just gods with one word written. He could be brought back to normal if his book was destroyed , but he made his notebook invincible, immortal, and omnipotent (since omnipotent equals another omnipotent) and only usable by him so only he can undo what he does.