Kaiu Yohiro

Kaiu Yohiro was a engineer of the Crab Clan, and one of the first Lost Crab to be given true mastery of their Taint by Daigotsu. He developed a massive siege engine of blackened and melted steel that seemed to grow out of the piled bones that made up the west tower of the Wall of Bones. The barely sentient wepon was called only "the Engine".