This feature has currently been removed. You may find it in previous versions of the mods, but not in the most recent version(s).
Willpower is a psychological feeling, when a person has determination to perform or continue a task, despite how hard it may be. In DC Comics' mainstream universe, it is used as the power source for the Green Lantern Corps to power their rings and summon desired objects. In the mod, Willpower can be collected from defeating criminals and can be traded with Stan Lee for Green Lantern's equipment.