Doggart

Freshen the Air
At entrance, he will give you some advice:


 * Doggart: Yer here ta tackle the trogs, arentcha? Jes hop down inta the sewers and ye'll be on yer way. But don't go down if yer friends aren't witcha! Can't get back out this way. I'll letcha out the other end, if ye unblock the vents n' cut 'em trogs off at the source some'ow. But if ye can't fight yer way through ye'll be Trog meat, d'ye see? If ye got no friends, don't go down!
 * You: No friends, don't jump. Got it.

After you slay Matriarch Sishliss, he will meet you by the exit:


 * Doggart: Not bar, not bad a'tall! Kilt em dead, dintcha, and fixed em vents too! Now shift yer rump on outta here—we all bin down here longer'n enough to earn our pay! This way, this way, afore em Trogs works up a second wind!
 * You: My thoughts exactly.