According to the legend, Lycaon, the son of Pelasgus, angered the god Zeus when he served him a meal made from the remains of a sacrificed boy. As punishment, the enraged Zeus turned Lycaon and his sons into wolves. And later on when god Zeus was satisfied he taught them how to turn back to human shape again but the curse reamined and whenever they want they can turn back to the wolves but they will suffer tremendous pain during shift. And from here the story of warewolfs started. But as promised their punishment was about to end  after few centuries. But warewolves started enjoying their superior powers of shape shifting. And started to find a way to create the curse permanent and they are on the final stage of success but they have to sacrifise a true Alpha. And finding a true Alpha is like searching a neddle in haystack.