Nidhoggr's Revenge is a customized dragon MvP that can be summoned in Eden Dungeon [Lv:3]. She can be summoned by killing 100-200 mobs in her map. She will try to strip all of her opponents' equipment at around 50% HP. This can be prevented by using Full Chemical Protection, although the skill does not protect accessories. She changes her element to Poison at around 25% HP, so you should either change your ammunition or use an elemental converter on your character.