Basically it would just make it 4 times as likely that the things that spawn are stronger creatures then say generic zombies or wolves… even ants to an extent. kinda like a reroll of the creature to see if it would have a higher difficulty score.
-also, i think a difficulty score tag on monsters could be handy
and finally “FUN” little thing
Hacking bank computer console
“Multiple Tankbots Fall from the ceiling”