Vulnerability

Creatures may be weak against special attacks or elements. Vampires and werewolves weak against silver, silver weapons and garlic. Fire elementals weak against water or frost. A weakness or vulnerability means it takes extra, e.g. 50% or 100% additional damage, or in some other way extra affected by it, e.g. paralyzed, slowed, stunned or disoriented. It works similarly to resistances, but in the opposite direction.