I've been wanding around and stumbled across a sewer entrance. It's full of Assassin Lizards, ghouls, corpses, zombies and giant spiders. I've cleared it out and have been wandering around for hours looking for the exit. I've only found a single level to this sewer from what I can tell.
I thought I found the exit at one point - a stairway at the extreme north of the screen but when I enter some big bald guy kills me within 2 hits. Is there a way out of this sewer or am I just SoL?