Siege of Castle Karstaag

Quick Walkthrough

 * 1) Rest anywhere and watch the cutscene
 * 2) Head through the doors at Castle Kaarstag
 * 3) Speak to the Rickling in the throne room
 * 4) Enter the Banquet hall and kill all the ricklings
 * 5) Enter the caves and kill the Grahks and the rickling
 * 6) Speak to the Rickling in the throne room again

Detailed Walkthrough
Rest and watch the cutscene, Hircine will tell you of a Rebellion at Castle Kaarstag and he wants yyou to stop it because someone he likes is the leader there. You will be in Werewolf form which will make travelling to Castle Kaarstag a lot easier then walking there if your on Solstheim, otherwise you'd probably want to wait till your a human though you will lose a lot of health (unless you kill a person nearby). Castle Kaarstag is most easily found by heading North of Skaal Village and following the coast west.