The demon resembled a massive caterpillar, he had several arms going down his body, it had small black sunken eyes and several small antenna on his head. A large black lump tipped his tail.
Oysnas could burrow underground and excrete poisons as he did so.
Oysnas had been lurking the grounds of Ryo Asuka's home for some time, it had been causing all the plants and trees to wilt and die early and out of season with its poisons.
Akira Fudo noticed the changes tot he garden as he entered Ryo's home, at the same time the caterpillar demon breaks through Ryo's floor and attacks, however Akira comes running through before transforming and tossing Oysnas through the roof, killing him. The effects of the attack cause Ryo to have a panic attack and both he and Fudo are pulled into the Timeslip.