Carnius Magius has asked the Nerevarine to deliver equipment to a group of Nords arriving on Solstheim. He's hired them to slaughter the colonists at Raven Rock, making it appear as if the natives did it.
The Skaal have apparently attacked the colony. Falco Galenus and the others were able to push the attacks into the mine, but there are now workers trapped in there. Falco suggests to go in, eliminate the Skaal, and make sure the workers are safe.