Upon returning to Fort Frostmoth, I learned that the fort had been attacked by strange, wolflike creatures, and that Captain Carius has been abducted.
The Disappearance of Captain Carius
Gaea Artoria suggests I should seek out the Nords who live on the northern coast of Solstheim. She says that these Nords worship animals, specifically wolves. She believes that they may be responsible for Captain Carius' disappearance. She doesn't believe they'll tell me much, as I am an outsider. So, she's given me a skull found in a Nord burial ground to give to the Skaal to better earn their trust. I'm to remain with them until I know more.
Saenus Lusius believes that I should seek out the Nords who live on the northern coast of Solstheim. Lusius tells me that these Nords are nature worshippers, and would know what these animals were that attacked the fort. He would like me to remain with these people, work my way into their confidence, though it may take a long time. He's given me a skull found in a Skaal tomb, in the hopes they will accept it as a sign of good faith.
I have found the Nord village. The people here have told me to speak to Tharsten Heart-Fang, their leader. He is in the Greathall.
Tharsten Heart-Fang says he knows nothing about the attack on Fort Frostmoth, and that the creatures that attacked the fort were not normal wolves.
I have returned to Fort Frostmoth and spoken with Saenus Lusius. He was disappointed the Skaal have not told me more, but not surprised. He wishes for me to return to them and live among them until I can find out what has happened to Captain Carius.
Gaea Artoria did not believe that the Skaal knew nothing about the attack or Carius' disappearance. She would like me to return, earn their trust, and continue to live among them. She believes that, given time, I might be able to find out what has happened to Captain Carius.