Incubus

Incubuses were loyal followers of the Emperor, who answered to his summons when he called all his most faithful followers to serve him in his army.

Description
In ancient folklore, Incubi were lusty male demons who caused nightmares, and assumed the form of handsome men to seduce women in their sleep. They also give their prey terrible nightmares for years to come.

They are described to show the appearance of man or woman, and the appearance of a bat (they are mostly half-human, half-bat). Similar to vampires, Incubi enjoy to prey at night, instead of the day. They get blinded from the sun easily, and sleep during the day.