Convert F4 into a Hellish Apocalipse?

[Encon4]

something like this: https://store.steampowered.com/agecheck/app/879420/ (Agony)

ghouls to burned zombies,

raiders to possessed or  demon cult worshippers

animals, creatures and mutants to demons all of the in one faction

 

diamond city, goodneighbour and significant settlements where humanity barely resist the demons.

And of course playing as female will be a bit more forgiving but with some consequences(if you can catch my meaning )

 

 

 

 

I know this might not be done for it could change radically the game, but I wanted to unload the idea anyway.