A map for Doom 2, initially designed in rather old ZDoom builds (and most recently tested in GZDoom g4.6.0), in which you fight your way into a fortified demonic structure, harried by watchtowers every step of the way. Each one fires on the player as an arch-vile would, and requires hitting an associated switch (general marble green, fitting the motif most of the fortifications use) to disable it, as they can't be killed normally. Aside from getting three keys to break into the heart of the fortress, two switches also control important parts of the defenses guarding the keep's throne room.Crossing the sea of flames, you have arrived at the outskirts of a demonic fortress. Along the only approach to the main gate, a small number of peculiar watchtowers stand, and more such structures ward the fortress walls.
One final fight follows once you've completed your objective, with an added bit of catharsis once you step back out into the courtyard. Aside from all that, there's a couple extra easter eggs that don't count as secrets, that unlock a few additional challenges to the map if you trigger them. You'll know it when you see it.
One of these days I need to convert the old Decorate hackery at the heart of this to use ZScript and add a bit of proper ACS scripting too, but for now it still all functions as intended.
Google Drive link
Doomworld link (may be out of date)
Screenshots:
Spoiler:With thanks to Kallin Argentclaw, Saltmummy, and Paul Smart, all of whom have helped with feedback on this map.
Paul in particular has a couple videos showcasing this map, albeit an older version which at the time had a bug that locked you out of the armory (and trying something that nowadays might spoil the location of an easter egg, and where you'll know find something useful in deathmatch):
Part one
Part two