Osabor was born from the blood, bones, and the bark of the spirit of the great Mychon forest. In its other life, it was a samurai who defended the Zebul border from the hordes that emerged after the great hand. It is said that he disappeared, wounded in battle, and ventured into the great forest. His spirit found him and took control, creating a grotesque creature that defends the forest from humans and demons. Tales are told to the children of Zebul, warning them not to venture into the forest alone, saying that if they encounter the living tree Osabor, it will abduct them and trap them inside a tree.