I spoke to Hrothgar and got quest to defeat Kormak. Went to Komak's cave and fought him, and defeated him. When I returned to Hrothgar's cage I did not have the key to unlock him. I can't complete the quest.
My quest Arrow tells me to return to Hrothgar and unlock his cage, but Hrothgar does not have yellow question mark over his head and Hrothgar still tells me to go defeat Kormak. So I fought Kormak and defeated him again, but still cannot unlock the cage. The quest does not give any further instructions and I can't determine any part of the quest that remains to be done.
Legendary Storm Wizard, Robert Rainbringer. Thanks.
Nvm. I figured it out. You have to stand back a ways from the cage to get the prompt to show up. Still, the question mark doesn't illuminate and it is not easy to figure it out. Hope this helps someone else or they fix it.