In my first encounter with Dreamer & Nightmare I one phased the boss fight (https://youtu.be/JGTQV3Hn9zs) but that was before the patch of 30/8/2019. That patch nerfed the build I was using in that video and also buffed the health of the boss. So in my second playthrough I wanted to see if a different build could one phase the boss and sure enough, even easier than the first. In fact, in this I also get Gorefist in the Alternate Dimension and, even though I had enough stacks to leave, I really wanted to beat him too - otherwise the actual boss encounter would have been much shorter. BUILD USED: AMULET - Gunslinger's Charm (increase fire rate by 10% and reload speed by 20%) ARMOR - Slayer (35% extra damage on next shot after reload) RINGS - Devouring Loop (crit hits have a 5% chance to deal 300% bonus damage), Heartseeker (crit hit damage increased by 15%) SECONDARY WEAPON - Hunting Pistol (with Wildfire Shot mod) PRIMARY WEAPON - Crossbow (with Hunter's Mark mod for 17.5% increase critical hit chance) ITEMS - Key item is Frenzy Dust (boosts fire rate and reload speed by 15% for 30 seconds), also have Ammo Crate just in case ammo doesn't drop. TRAITS THAT ARE KEY: Exploiter - Weak spot damage increase 20% Quick Hands - Reload speed +30% Executioner - Critical hit chance +20% Kingslayer - Critical hit damage +50% Mind's Eye - Ranged damage +25% METHOD: 1. Kill Dreamer with Hunting Pistol. This ends him fast and builds the Wildfire Shot ready for use. 2. Stay in Alternate Dimension using Crossbow until 25 stacks. 3. Leave Alternate Dimension, activate Hunter's Mark mod on Crossbow. 4. Switch to Hunting Pistol. Activate Wildfire shot, unload on boss. 5. Switch back to Crossbow. 6. Activate Frenzy Dust. 7. Don't miss. The end. EXPLAINED: The build itself gives you a lot of raw damage from the Slayer set because it applies to each Crossbow bolt. However, the win comes from critical damage. Crossbow has 20% critical chance. Add the 20% from Executioner and the 17.5% from Hunter's Mark and you have a 57% critical chance. Every time the chance procs, you also have +50% critical damage from Kingslayer AND +15% from Heartseeker, meaning your critical damage is boosted +65%. As a result critical chance is high, critical damage is high, and boss gets melted :D Also, yes, this is Normal mode. I'm not doing Hard or Nightmare until I've gotten all the exploring out of the way, otherwise making guides would just be a tedious slog that would take forever. There's plenty of time for harder modes later :D ... https://www.youtube.com/watch?v=AtTj4t5D6ds