I did a solo all the way with a conjurer. It was ages ago, so I can't remember the exact stats, but let me tell you, do NOT try it unless you have more than enough time on your hands and are not going to whack the screen at every reload. The amount of time I saw my hand turn to golden dust...brr.
Although I must be straight...I didn't kill Sarevok. That was the mage.

I wore down Sarevok with summoned monsters, the amge killed him with fireballs aimed for me (don't you love flame resistance potions?

)
I tried soloing a fighter, but it was too boring. Soloing a mage is MUCH easier in BG2 BTW.
EDIT: Oh, and I did do that ice island, but I attempted Durlag's and it was WAY too hard without a thief.
[ 01-24-2003, 03:54 PM: Message edited by: Horatio ]