A good Slayer has a mastery of how to use their tools and weapons. But a great knows when to use them. In DOOM Eternal, you must combine brutality and brains if you want to have a fighting chance again Hell's armies--which is where the core combat loop comes into play. The flow state of combat is straightforward: Glory Kill for health, Chainsaw for ammo, and Flame Belch for armor. Keeping this formula in mind during battle is key and could mean the difference between a stunning victory and a brutal defeat.