The Sunken Sewer

There are two paths through this quests. When you enter, you can open a strength sealed door (I believe you must have a strength greater than 15 to open it) or a locked gate. If you go the path of the strength sealed door, you'll find yourself fighting kobolds and, optionally, spiders. If you go the path of the locked gate, you'll find yourself doing little fighting, but you'll have to disable a lot of traps. Either way is comparable for effort. The strength door route has an optional section where there are spiders (and occasionally a named brown spider). The locked gate route occasionally has a named rust monster.

Named Villians:

?: Brown Spider

Blight: Rust Monster

Reward:

Random item from quest-giver.