Incubus

An incubus is a type of demon in the Burning Legion forces.

Outside the Warcraft universe, the are the male equivalent to the succubi. It is possible that it's the same way in the Warcraft universe, and therefore perhaps they males of the sayaad race. Such context was not given in The Last Guardian.

Official rumors
If it even exists, the incubus is the male counterpart to the succubus. The succubi themselves spread rumors about them, such as:


 * Yes, there are incubi, but the spell to summon them has been conveniently forgotten by mortal practitioners and Burning Legion agents.
 * 1) Incubi are kept as slaves on their home planet, having been rendered incapable of escape or independent movement.
 * 2) The succubi consumed the males of their race when they were brought into the Burning Legion. (Alternatively, the act of devouring the males is what caught the attention of the Burning Legion.)