A fantastic city map with just the right amount of combat and a bombastic ending that made me eat my words at least four times before I buckled up and treated it fairly again. :P
Sidenote: I think some of the lag towards the end comes from one of the mods I had loaded, for some reason it seems to tank performance on a map this size. Toss in the dynamic lights generated by the imp fireballs and I'm surprised it didn't turn into a slideshow.
Sourceport: GZDoom 4.11.3 - https://zdoom.org/downloads
This mod targets LZDoom 3.88B, but works perfectly in GZDoom 4.11.3 too.