Hidden Heart of Iuchiban

Hidden Heart of Iuchiban was an iron box keeping the heart of Iuchiban.

Iuchiban through a gaijin ritual removed his own heart. This process made him a Khadi. He would exist for the eternity as long as his heart remained intact, so keep the heart hidden was Iuchiban's priority.

The Hidden Heart was destroyed by Isawa Sezaru after he defeated Oracle of Blood. Iuchiban was killed little time after.