Oh good.
I'm not the only psychopathic Drow-killer around here.
I never leave any Drow/Spider alive in the Drow City when I'm done.
I even bother to enter the Taverns, houses and the second floor to exterminate all Drow life.
By the way, I do this only with one melee fighter, the rest of the party stay put while the fighter with Boots of Speed and what-suchs, goes on a murderous rampage.
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If not a Sorcerer, then a Paladin.