SPOILERS:
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There are only several of side-quest in the drow city: 1) a lich, 2) clean out an area full of some jelly worshippers, and 3) get brain for a fish. Personally, I never do any one of them, I just did Phare's quest really quickly and get out of Underdark ASAP (it's nice to see the sun again).
Also, you can have some fun in the travel, like blowing up human slaves, or go fight/challenge drows or monsters in either one of the pits.
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