Kala

Kala is the founder of the Ususama Style and the (current) main antagonist of the series. He once served the God of War Fudo Myo-o and is said to have destroyed several stars single handedly. He is the mastermind behind the ambitions of Ata and the Ususama Style, and is said to seek both Pandora's and Mandala's Box in order to destroy and rebuild the galaxy to its original shape.

Yasha tried to stop his onslaught for centuries now, and seeks with Daruma Pandora's box in order to put an end to Kala's plans. Kala current whereabouts are unknown, but he is said to hide somewhere in the galaxy, while still destroying stars.

(Source: Samurai 8 Wiki)