Ylva

Ylva, a mate of Guarm, is a rare elite helhound located in Helgarde Keep of the Maw.

Earn the achievement Guarmageddon by killing her offspring: Frekki, Girs, Hrodvetni, Vargir, and Vanargun, all located relatively nearby in the keep, before defeating her. Each offspring killed will debuff the player with a stack of:

Bring a group. And a healer. She already hits hard and the debuff makes her hit even harder.

Ylva also drops the Feeder's Hand and Key, grants progress toward Containing the Helsworn and is required for Conquering Korthia.