The Bone Witch in Njorndar Village wants you to defeat Iskalder upon Battlescar Spire.
1x Iskalder defeated in battle
Atop the tallest peak to the southwest overlooking Jotunheim is Battlescar Spire. It is a place of reverence for the vrykul, second only to Valhalas in terms of where they prefer to do honorable combat.
We shall visit not-so-honorable combat upon it.
Gather your companions and fly to the spire. When you are ready, light the signal fire and I will appear within the body of Iskalder.
We will fight, you will win, and Vardmadra is sure to come to witness the battle!