Ah, so
that's why you were away for so long, Lord Brass. I think you were actually
ahead of me in posts at 1 point.
No need to post on the BG2 forum, I scout this section regularly (semi-daily) as well....although I only tend to post on interesting topics. (Not stuff like "What class should I be?" and "What is this THAC0 thing?")
The most obvious answer to your negative damage from a Fireball, Halbarad, is your character's Fire Resistance. If you crank it over 100%, fire will indeed heal you. Offhand, it sounds like you had the Helm of Defense, the Ring of Fire Resistance, and a Potion or Scroll of Fire Resistance, while Imoen had....nothing.
I've been up to some new stuff since we last spoke, Lord Brass.....check the link in my sig. [img]smile.gif[/img]