The classic infectious disease model. One survivor's trauma becomes the next victim's nightmare.
Every monster needs a weakness to give the protagonists a fighting chance. Rules for Werewolves
How does one become the beast? This dictates the tone of your world. The classic infectious disease model
The full moon is the gold standard. It provides a ticking clock and a predictable cycle of dread. Rules for Werewolves
Transformation triggered by anger, pain, or elevated heart rate makes the character a walking powder keg.