Raiu of the Dark World

Raiu is primodial demon of the Dark World and is somewhat a counterpart to the 10 Tailed Beast of Naruto's World.

History
Raiu inhabited and terrorized the Dark World along with it's shinobi inhabitants. The shinobi felt threatned by him and hid in fear. No one could do it because of his fearsome demonic power and feared for their lives. Then, a brave and powerful ninja faced the beast and sealed him into an Onyx.3 objects were created from this sealing, First, the