I can help you, possilby do it for you?
But, what I have done in the past and will be doing on my zerker is this:
1. Run into the big open space where he spawns.
2. Entangle him and run 5-10 steps back.
3. MANUALLY cast the elemental spell that hurts him, forgot which one, it may be air.
4. After casting it maybe 6-7 times, get entangle ready and wait till he moves and snare him, and run south towards him, past him, then 10-15 steps away from him.
5. Basicly repeat.
As I mentioned earlier, I could do it for you for free, I find these fights fun/easy. I could also help you out in the tunnel by diverting some of the monsters away from you, so you take less damage.
If you decide you want me to do either of those, please PM me.
I really don't recommend ranging Damis, he's really easy to kill, and with your mage level, it should come as a joke.
If you really insist on ranging, I don't know what I should recommend, as every other time I did it, I used mage.
Either way, Gl with Damis, I found him quite easy to kill.
EDIT: Very nice account you got there!
