Seima no Hametsu

A Seima no Hamestsu (Holy Demon of Destruction) is a ancient race of immensly evil and powerful demons sealed in body od comprised Divine Reishi (Spirit Particles).

Background
This demons are very few in number only six have every been records In the Soul Society where human soul lived before, humans lived in the World of the Living some were born as spirits. Now if a soul had done great sins before their death they would go to Hell when they died. Now most sinner would just remain bond to their fate, however six truly souls start looking into Hell and was trying to make it their world. They wondered for years until their reach of the deeps part of Hell. The contentration of immense evil Reishi corrupted them futher to where they became evil spirit beings that the Kosumosukihaku first Supreme King called them Demons. The Demonic Reishi had cause them to become, mindless monster of destruction. One day, they broke free out of Hell and started to attack the Soul Society. The cause unrealistic damage and death. The first Saikououja (Supreme King) came and instead of just purifying them he used a spell to make six body made of Divine Reishi and sealed each demon inside. Inside, they regained their minds but were just demons in a different form.

The King then took them, back to Hell. He told them that he would let them live as they would protect souls from finding the place that turned them into demonic spirit beings. Due, to them have a body made of Divine Reishi they cannot be touch except by the strongest of demons, let alone defeated as they have demonic and divine spirit energy. The ruled the deep part of Hell as thanks for being free of being minds monster, though only as they injoyed to know with them killed. They would tortue sinner of hell. The King sensing the danger cast a spell that closed off where the six demons lived. He also, put a spell to put them asleep until they are found. Since most cannot reach that of Hell most just forgot them until millions of years later they were found and released again. By whom is unknown.