The Bone Witch in Njorndar Village wants you to possess a Water Terror and use it to slay 10 vrykul in the greater Jotunheim region. Qualifying vrykul are Jotunheim Sleep-Watchers, Jotunheim Warriors, Mjordin Water Magi, Njorndar Spear-Sisters, and Valhalas Vargul. * Jotunheim vrykul slain while possessing a Water Terror (10)