Oni (Mystic)

Mystic Oni (妖鬼) are a semi-spiritual evolution of Kijin with greatly improved magical characteristics, making them closer in essence to their Elemental ancestors. Their powers can even reach the level of unawakened but "mature" Demon Lord Seeds like Carrion.

All the survivors from the Ogre village except Shion evolved into Mystic Oni during Rimuru's Harvest Festival, while Shion evolved into a Wicked Oni instead.