Oni

Oni are an intelligence based evolution to Orcs, Oni are much stronger than orcs and can use much more powerful magicka. Oni tend to be from 5ft to 7ft tall and are quite slim, unlike orcs who are more plump and taller. Orcs evolve into Oni when they have reached sufficient power and with enough intelligence gained.

Oni are similar to Ogres in the fact they both evolve from Orcs but whereas Oni evolve due to intelligence, Ogres evolve due to Strenght. This may appear that Ogres are much stronger than Oni but Ogres tend to have low cognitive skills and only use raw power, It is possible for Oni to beat Ogres due to skills and magic and some Oni can even beat an Ogre in raw strength with enough training.

Oni are much rarer than Ogres due to the low intelligence of Orcs

(see also Dark spawn creatures)