Halyar's Retreat is a middle-class suburb that gradually became the hangout for all sorts of illicit businessmen and gangs. The titular greenskin soldier consolidated power and control, keeping the peace while criminal activities continued. However, when he was killed, chaos erupted and this particular area of Nexus became a lot less safe for all living and visiting there.
The team said that it originally envisioned Halyar's Retreat as being gothic architecture on top of plateaus, but it never gelled with the layout of the city. Instead, the concept was re-worked into a slightly upscale industrial suburb.