Figured we should start a thread to discuss strategy for this quest or at the least, to share info on it. Here is the info I have atm:
Dagnor the Beserk
Rating: 125 Kwellen Beserker
HP: 65K approximately
Known Attacks: Beserker Barrage-roughly 3k to 4k of mind damage
Boil Blood-roughly 2k of spirit damage
Known Weaknesses: Fire and Nature seem to hit for damage
Respawn: Less than 10 hours.
Please feel free to add more info. I'll post as I gain more knowledge.