Raging barbarians replaced with literal demons. XCom unit replaced with BFG squads. I could see that working. There’s a mod I play for Civ 5 which adds a barbarian civ which - when they defeat things - turns units and cities into MORE barbs. It’s fucking brutal and turns the game into a ‘last man standing’ rather than anyone being able to win. I love it!
It is supposed to be, technically. IIRC, you’re supposed to copy your own stuff - such as BIOS and ISOs - rather than download others, which is why things like PCSX2 doesn’t natively come with a BIOS.