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If you want everything and the kitchen sink, then this is your mod.
Especially with story mode and several editions, this is the natural continuation of the STALKER series.
This has been in development for nearly a decade, past any point that anyone would have reasonably said "It's done". The author could have rested on his many laurels and no one would have faulted him for it, but instead he's kept adding features to it that constantly surprise and delight. This is THE go-to DooM mod that was (not that ID would admit it) probably the inspiration for much of the DooM 2016 game. If you haven't played this mod, it's going to become a welcome part of your life for the next few years or so whether or not SGTMKIV stops working on it or not.
Perfect with brutal doom monsters. This thing will always be on my hard drive.
Obviously took a bit of work, even with many of the assets being re-purposed.
Works great.
Worth it just to offed the SJWs.