Cheers everyone! I haven't had time to try everything out yet, hope i'll make it
But hey! Why not look at the bright side: If I have to go back to an old save, it will give me hours of extra gaming time...
About those Doomguards: One of my toughests fights in the game. Here's how I managed (and will manage if I have to, again):
SPOILER
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Dynaheir: A couple of fireballs into the room until she has to flee. Then magic missiles.
Viconia: Summon animals I, chant, defensive harmony, wand of the heavens ad lib.
Me (thief/mage): Summon monster II, Ring of missiles(?) ad lib.
Coran: arrows of fire/acid/ice/biting ad lib.
Ajantis: Potion of hill giant strength/of heroism.
Shar-Teel: Potion of stone giant strength/of power.
Mean, eh? Only worked on the 7th reload, and the XP are 2000 for each...compare that to the Greater Bassilisk (4000!) you had for breakfast...