終わり (The Owari)

Description
The Forbidden Hason Seal seals a living creature that has lived for thousands of years. This Creature was called,"終わり". (Owari)

This 終わり has been haunting humanity for hundreds of generations. Katsuko mostly knew what this was since his father wrote scrolls about the legends.

Jigoku wishes to release the 終わり to plunder the world into eternal Darkness and take it over himself. When Jigoku awakened the Owari, it first went into a human form to disguise itself from Ryu and the others. The Forbidden Hason Seal was actually sealed in ITALY.

The Forbidden Hason Seal
The Forbidden Hason Seal was a weapon that was sealed away from the great Hero Yusha, in ITALY. Which holds the OWARI. After sealing the darkness Yusha has to give his life in order to seal it away. His death basically caused the discovery of the Energia's.

Yusha died from using his Mage Powers and his Energia to seal the Darkness away.