Brawler Mode is a challenging game experience created by Under The Mayo. I'll link to his YouTube videos explaining the rules. My first attempt will be what I call Brawler Mode Lite, which is to apply the Ultra Nightmare rules update to a regular Nightmare run. In short, UN allows for 2 adjustments. 1. All health and armor crystal upgrades are permitted, but only from crystals found in level. The unlockable Sentinel crystals found on the Fortress of Doom are banned. 2. The second frag grenade is permitted, but only after you reach Mars Core. Brawler Mode Official Doom Eternal Rules • "Brawler Mode" for Doom Eternal - Official... UltraNightmare Rules update • Brawler Mode Rules Update for ULTRANIGHTMA... -- Watch live at / masterninja3000