Extremely powerful mages summon these to do battle. They are essentially the platonic form of a particular weapon. Because the true platonic form of a weapon is not easily visualized, mages are trained to focus on the images of legendary heroes associated with that particular weapon in order to give it a humanoid form. There are six playable Exemplars in the game: Zulfiqar, Longinus, Apollon, Mjolnir, Winchester, and Dardanelles.
Exemplars can evolve into Order or Chaos forms depending on the choices you make for Diplomacy Decisions.