Caius is a member of The Third Truth, a fanatical cult aimed at releasing a self-proclaimed god, Murama Daikyo. Caius temperament is calm, contemplative, until he comes across a Nekokai. He came to the Warrior’s Temple to retrieve the Monolith, a massive chunk of Obsydian Stone that reacted to the presence of the Ryugou blade. The reason why is unknown.