It's alive!
And it's hideously unbalanced!
Presenting... Something I haven't actually thought of a name for yet! "Overpowered monsters, oh no!" will do for now, I guess.
annoyingb.wad
Skulltag version (Name included!) is in the works, btw. Consider this the "diet" version.

Edit: OOPS! I forgot to copy over my change to the cacodemon's shot from my test wad. Please download again if you have already.
Edit again: I forgot to mention; You should play this with either the weapons mod of your choice, or with double ammo, 'cause you're gonna need some extra firepower. Also I think I made the Cacodemon too powerful. I'll be nerfing it (and the fire soul) a bit for the Skulltag version.
Actually, to be honest, the Skulltag version is what I was originally working on, but I got rid of the skulltag stuff and the extra resources for this version. The monsters are so overpowered because this was really meant for co-op.
