Werewolves

Werewolves are humans that have been infected by wolves. At night, as the moon comes out, they turn into wolf-human hybrids. They are stronger then humans, but while in their wolf form they lose their minds, and become wild animals. Once they return to their human forms, they lose their memories of the night before. Only the royal family is not affected by this.

History
The werewolves are descended from humans that were attacked by wolves that had been transformed into the earliest werewolves. Their attempts to rejoin humanity have been met with swords and fire, making them angry at the humans and allies with the vampires, as they both are hunted by the humans. They originally lived in the Forests of Asaron, until they were burnt down by humans. They now live in the caves of Death Fang Island.