The Stormfather

Steps

 * 1) Go to the Lake of Ill Omen in Fens of Nathsar, find the altar of Karana on the shore ( 146.86, -119.18, 146.23 ).
 * 2) Use the portal seeds to create a portal for Askr to come through.
 * 3) Fight the elementals as Askr casts, keep him alive.
 * 4) Fight the Avatar of Bertoxxulous and his two friends.
 * 5) The Avatar of Storms will finish off the Avatar of Bertoxxulous.
 * 6) Speak to Askr to get your cloak.

Credits
Pheep  Unrest