Hell's Precipice

This was a hard quest for me! It was getting me frustrated, so I did the bonus first. You have to divide and conquer the enemy, because if they swarm on you, it's all over.
The way I killed the final boss was to wait til he got in the center of the platform, and I attacked him with my bow from the top step of the platform opposite him.
After you kill him about three times, he finally dies for good!
Then it was back to Droknar's forge for my reward!