Shorah

It seems you got very lucky. Harm checks for magic resistance also.Originally posted by Zaha:
This is how I killed mr. Firkraag:
Jaheira - Casts Harm: Jaheira
Jaheira - Attacks Firkraag
Jaheira - 20+5=25: Hit
Jan - Casts Magic Missile: Firkraag
Firkraag - Magic Resistance
Jan did 3 damage to Firkraag
Firkraag - Death
Your party has gained experience: 64000
Combos like these work on strong individual enemies. If you have Anomen(or other strong cleric), he can use Holy Power + Gauntlets of Weapon Expertise to be able to Harm the dragon with less than a roll of 20.
Another way to kill the dragon, much cheaper but lots of fun, was to have 6 high level mages imported to a game save just before facing mr. Firkraag, then casting spell sequencer with all of them, filling it with magic missiles. Then I cast simulacrum with five of the mages(and got 11 mages there), and the sequencers got copied to the simulacrums. Some lower resistances to Firkraag, dropping his magic resistance to 0%. Then you just release all your sequencers simultaneously. A single magic missile deals on average 3.5 damage, so I could deal him 11*3.5*5*3=577,5 damage during a single turn. That's got to hurt.