Retrieve Hauteur's Ashes and then return them and the Ritual Torch to Temper at Emberglade on Azuremyst Isle. Remember that you can use the Orb of Returning to teleport back to Temper once you have the ashes.
The owlbeasts of Moonwing Den on Silvermyst Isle, far to the southwest, have been deluded into thinking that Hauteur is a god to be worshipped. What he truly is, is a fallen elemental who needs to be put out of his misery. That torch is the key to his downfall.
Hauteur regularly demands that these owlbeasts burn an effigy in his honor. So, when you light it, he will come. Slay him and bring me the ashes. Then use the orb in the satchel that I will give you to return to me here.