The Lycan race is dying and there's nothing they can do about it but watch their race die out.
Since then they have resided in a cave sleeping until they were disturbed by people roaming around.
Awoken in a fit of rage the group of Lycans chased out the humans and killed them. Feeding off of the humans got them their strength back unless the host was sick then they would have to fight off the sickness themselves.
They decided that the best way to repopulate their species is to breed any and all women. Now all that stand are five lycanthropes who have to adjust to the new world, feed without being discovered, and breed with women. Mortal women.