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Lycans are a second breed of Werewolves created in the 13th century, descended from William Corvinus's Werewolf bloodline. Once normal humans who were infected by the firstborn Lycan or another of his victims, they are unlike the first breed in that they retain their human personalities while transformed, as well as being capable to take human form. In this article, "Werewolf" will be used to refer to both Werewolves and Lycans collectively (except where otherwise noted), for when both generations need mentioning at the same time.

Lycans are constantly at war with the Vampires due to their former status as oppressed slaves, and the Vampires begin a campaign to exterminate the entire species after the Lycans stage an uprising that nearly destroys the entire Vampire species in the 15th century. Although the war was believed to be a righteous cause of the noble vampires against the savage Lycans, in truth the war was instigated by Viktor out of hatred for Lucian for impregnating his daughter Sonja . The war has recently come to an temporary end, after the death of Marius .

In the Underworld franchise , Lycans and Werewolves are biologically immortal transgenics , as opposed to supernaturally immortal demons of pop culture. However, as in pop culture, the Lycans in the Underworld franchise are also carnivores, meaning that they feed on meat. They have even been shown to be somewhat cannibalistic, as they will feed off of humans and Vampires, despite the close relation they bear to both species.