Sylar | DOOM Eternal - Kaiser Campaign Level 11: Sentinel Prime [Nightmare, Deathless] @sylar1313 | Uploaded July 2023 | Updated October 2024, 22 hours ago.
I am not 100% sure about this boss fight. The gladiator second phase has a new "machine gun" attack on his weapon spins that's a bit busted (maybe on higher fps only? I don't know for sure). And the encounter lacks ways to restack on armor. Finally you don't get healed after you beat the gladiator, which makes the next encounter to unlock the secret level kinda unfair. The encounter itself starts with a bunch of chaingunners which you can't easily dispatch or farm and will inevitably deal some chip damage... unless you fire the BFG in the air :)

mod link: nexusmods.com/doometernal/mods/69

0:00 - Level Start (there's a hidden target that let's you fight the gladiator earlier, forgot to show it here)
2:14 - Sentinel Crystal
2:55 - Escalation Encounter - Gladiator + Dark Lord Boss Fight
6:40 - Secret Level Armageddon Unlock

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Key binds:

Combat Shotgun = TAB
Heavy Cannon = q
Plasma Rifle = 3
Rocket Launcher = f
Super Shotgun = r
Ballista = e
Chaingun = 1
BFG = 4
Crucible/Sentinel Hammer = v
Grenade Swap = x
Mod Swap = Cltr
Dash = Shift
Chainsaw = c
Weapon Wheel = g
Grenade Launcher = Mouse 4
Flame Belch = Alt
Melee = Scroll up/Mouse 5
Jump = Scroll down/Space bar