The Oni is an assassin, which can be summoned using a Demonic Summoning Stone or a Mysterious Summoning Stone.
- The level of the summoned creature will be the same as the summoner's actual level (it will not be increased by Journey to the North or Sunspear Battle Call).
- When the party is resigned and the Oni is fighting masterless minions, it appears to be able to use Death's Retreat without a target.
- An Oni is a monster from Japanese folklore. The term is often translated as "ogre" or "demon".