Attributes
Inspiration Magic 9
Fire Magic 15 (11+3+1)
Water Magic 11 (10+1)
Energy Storage 5 (4+1)
Skills
1. Arcane Echo
2. Mist Form {E}
3. Flame Burst
4. Inferno
5. Phoenix
6. Mantra of Resolve
7. Channeling
Ok, this build can't take the avicaras.
When you reach the cave, do Mantra of Resolve and Channeling, go little further. When trolls are just outside your aggro circle do Arcane Echo, aggro trolls and do Mist Form.
Then it's just easy. Remember to keep Channeling, Mantra of Resolve and Mist form always on.
Video
http://files.filefront.com/Ele_Troll.../fileinfo.html