Return to Graystone Yard to destroy the Sullonite Artifact. ( 920, -154, 287 ) Copy/waypoint 920, -154, 287
You will have to click the Sullonite Artifact 6 times to destroy it.
Each time you click it, Marweth Wrathborn will attack. Marweth uses only one attack, the massively damaging Circular Rage. The only defense is to joust back out of range.
Each time Marweth is reduced to no health, she will become dazed, but quickly begin regenerating. You'll be able to get one click in on the Sullonite Artifact in between battles with Marweth.