- Chinese: 鐵克無極
- Pronunciation: Tie Ke Wu Ji
The Iron Dimension's ultimate weapon in the form of a guitar that only an Ultimate Iron Man can control and use to manipulate the worlds. Others fear to speak its name because it would cause people to go insane once they say it, so they refer to it as "That Thing" (那個) until its master takes control of it. The current master of this weapon is Xia Tian.