The case of the bloody corpse: The Cogs - Kyber's Gate
The cogs was oppressive as you had heard, a thick all encompassing smog, and the distance the towers reached to above meant everything was in a perpetual twilight.
It takes a bit of time wondering between forges, factories and workshops to reach the area called Kyber's Gate.
It's a rough looking slum, most of the people you can see are Goblins, orcs and gnolls. Some watch you warily and most seen busy with their own affairs.