Oni

History
150 years before the current timeline the mysterious creatures, Oni have appeared and killed every one of the famous warring states commanders then took over Hi no Moto. More than a century later humans were completely under the Oni’s control and started to worship them, like praying to them or giving offerings.

Overview
Oni are feeding on crystals and metals.

Weak Point
Oni's weak point is their horn, Shinkaku which is made of a really tough material. It cannot be slashed without a special weapon, called Kitetsuto. On the other hand every spot (except the shinkaku) can be cut. When the horn is cut off the Oni dies and just Oni iron sand, Kitetsu left over.

Kishin
Are the strongest type of Oni, the boss. It is said they are grotesque with the faces of devils and the power of gods. There is more than 100 Kishin in Hi no Moto' s territory.
 * Engoku Tengu

Small Oni

 * Nekomata Oni
 * Kodama Oni