Harike's Obsidian Stone

The Harike's Obsidian Stone was used by Kuni Harike to put the Kusatte Iru in an eternal slumber.

Crafting
Harike bound kami to the stone permanently, enslaving them in a mad and diabolical ritual, to defeat the great oni and protect the Empire.

Spells
Harike stored a great deal of magic within the stone, powerful spells that he would expect to use, including the maho spell 1000 Years of Terrible Slumber. They were activated when coated with fresh blood, which made the stone to appear as as a heavy lung, wet with blood and mucus. All of its powers became evident, as if the stone were speaking and breathing.

Kuni Harike
In 634 the Kusatte Iru was defeated by Kuni Harike using the Stone.

Higashato
In 1123 the Bog Hag Higashato performed a long-range plan to avoid the oni to awake. A group of magistrates were accomplices of the sacrifical ritual, as the lesser of two evils.