Destroy Arcanimus and then return to Ethenial Moonshadow at Moonrest Gardens.
There is one last thing that I would have you do, [player] the [race]. I would have you destroy Arcanimus!
The sorcerers to the west used that giant device in the sky to bore a massive pit into our resting place. When they did that, they unleashed a monstrosity!
I would not care if it were only a concern for mortals, but Arcanimus feeds upon the spirits of the dead.
You will put an end to it now!