Grimesilt wasn't as high up on the chain as I thought. We'll have to take out his superior and find out what he knows.
Dig-Boss Dinwhisker's his name, and he runs the Dark Iron digging operations within the Cauldron, just northwest of here. His excavators and footmen patrol the eastern side of the Cauldron, digging downward, day and night.
He's not known to show his face out in the field very often, but if you slay enough of his men, he'll be forced to come out and deal with you.
("Dinwhisker is Grimesilt's superior. Hopefully he has more information.")
Rewards
You will receive: 70
Progress
If Dinwhisker doesn't have what we seek, I'm not sure what we'll do next.
Completion
A... an ember? What is this thing?
Notes
Run to the north to Dustfire Valley, then turn southwest to enter the cauldron. Then start killing Dark Iron dwarves indiscriminately until Dig-Boss Dinwhisker spawns.
Dig-Boss Dinwhisker yells: What in hell's name is going on out here?
Dinwhisker spawns from the west end of this part of the cauldron and does a counter-clockwise circle of the area. Kill him and he will drop his Dark Ember on the ground. Thus, players who did not get the tap can still continue the quest.
On complete:
Jack Rockleg says: Let's see what this ember does... whaaaa?