‘Doom II’ was more than a follow-up, it was a formula for a whole new genre. Let’s start with the demons. The most memorable is the OP Arch-Vile, resurrecting dead enemies as he sets you on fire.
Doom games, throughout the ages, have one simple premise: Kill demons with big guns. The formula has been modified slightly over time – our new era of Doom is now "kill demons, big guns, HEAVY METAL," ...