Looking for WADs akin to Eternal Doom.

[Nems]

I got to thinking about Eternal Doom again recently and remembered that we're probably not gonna get a full version of Eternal Doom 4. This made me sad but it also reminded me that I could have very well overlooked WADs that were inspired by Eternal Doom (4) and/or serve as spiritual successors to them. I can't seem to think of any WADs that fall under this aside from a level or two in some megaWADs so I thought I'd ask here and see if anyone knows of such WADs. O: