Doom Eternal Campaign Walkthrough: Every Boss Defeated

17 August 2025

Whether you're ripping and tearing through demons for the first time or sharpening your Slayer skills, Doom Eternal doesn’t pull punches. The bosses are some of the most intense showdowns in gaming, and each one is designed to test your reflexes, strategy, and patience. From the first fight to the final battle, there’s no room for error. Buckle up, Slayer—here’s your complete walkthrough to obliterate every boss in Doom Eternal's campaign.

Hell Priest: Deag Nilox

Before you face the real heavyweights, the game tees you up with Deag Nilox. This guy? It’s more like a glorified tutorial than a true boss. By now, you’ve already warmed up your arsenal, so this is your chance to test the waters.

- Key Strategy: Focus on crowd control! It's not just about Deag Nilox; the arena will swarm with demons. Chain together your chainsaw for ammo and flamethrower for armor pickups. Master the balance of offense and defense here, as it sets the tone for future fights.

Doom Hunter(s)

You’d think taking on one Doom Hunter would be bad enough, but Doom Eternal says, "Nah, let’s throw in two for good measure." These half-demon, half-mechanical nightmares come equipped with shields, a hovering chassis, and brutal long-range attacks.

- Phase 1: The strategy here is clear: destroy that shield. Use your Plasma Rifle to take it out fast; it’s a game-changer. Once the shield is down, focus your heaviest weapons (Rocket Launcher is your best friend here) on their sled.
- Phase 2: Once you destroy the sled, they’ll switch to ground mode and become a little easier to handle. Keep your distance, maintain constant movement, and shred them down.

Pro tip? Don’t get cocky and conserve your resources for the second Doom Hunter—you’ll thank yourself later.

Marauder

Ah, the Marauder. Just hearing the name sends shivers down the spines of even seasoned players. This guy’s basically a walking skill check. He’s fast, he’s relentless, and oh—he’s got a pet hellhound.

- The Trick: The Marauder punishes aggression. Wait for his eyes to flash green, then counter with heavy attacks. Don’t spam shots randomly; every missed opportunity is a potential death sentence.
- Movement is Key: Never stop strafing or dashing. The hellhound will nip at your heels, so prioritize taking it out when safe openings arise.
- Weapon Choices: Equip the Super Shotgun and Ballista for this fight. They're your go-to tools for countering his attacks.

Truthfully, this fight will test your patience more than anything else. But once you’ve mastered it, you'll feel like a god—until the game pits you against multiple Marauders later on.

Gladiator

The Gladiator feels like a twisted gladiatorial match straight out of hell (because, well, it is). This towering beast comes equipped with a massive shield and a deadly chain flail. The arena is circular, meaning you’ll be dodging attacks from all directions.

- Phase 1: Wait for the shield to flash green—that's your signal to strike. Use precision weapons like the Heavy Cannon or Ballista to maximize damage here.
- Phase 2: The shield is gone! However, the Gladiator’s attacks become much faster, and he starts mixing in double swings and ground pounds. Constantly stay on the move, and don’t get greedy with your shots.

This fight boils down to timing. Think of it as a dance—except your partner is a giant demon trying to crush you like a soda can.

Doom Hunters (Again)

Oh yeah, Doom Eternal loves to recycle pain. You’re up against not one, not two, but THREE Doom Hunters later in the game. By now, you’ve already faced these guys, so you know the drill. The real challenge here is staying alive long enough to dismantle them one by one.

- Split and Conquer: Don’t try to take them all head-on. Focus on isolating one Doom Hunter, take them down, and repeat.
- Resource Management: Ammo and health are crucial here. Use chainsaws strategically to keep your supplies in check.

Trust me, after this fight, you’ll feel like a certified demon-slaying ninja.

Khan Maykr

The Khan Maykr is one of the most unique bosses in Doom Eternal. She hovers above the arena, raining down attacks while summoning drones to keep you busy. This multi-phase fight can be overwhelming, but don’t lose your cool.

- How to Damage Her: Strip away her Maykr armor by using the Ballista or the Precision Bolt. Once her armor is down, her exposed body becomes vulnerable to Glory Kills.
- Drone Farming: The drones she summons are more than nuisances—they’re your lifeline. Chainsawing them will refill your ammo reserves, so don’t ignore them.
- Movement is Everything: Her laser attacks and area-of-effect abilities will keep you on your toes. Constant movement is the only way to avoid being overwhelmed.

While her fight is more about endurance than raw difficulty, the payoff for taking her down is oh-so-satisfying.

Icon of Sin

This is it—the big finale. The Icon of Sin isn’t just a boss; it’s an event. This towering behemoth is a two-phase nightmare designed to push you to the brink.

Phase 1: Armored Nightmare

The Icon of Sin enters the fight fully armored, and your goal is to strip that armor piece by piece.

- Target Weak Points: Start with his arms and head, then move to his chest and legs. Use weapons like the Heavy Cannon’s Precision Bolt or the Ballista to deal pinpoint damage.
- Manage the Chaos: While dismantling the Icon of Sin, the arena will flood with demons. Don’t ignore them—take breaks to clear the horde and replenish your resources.

Phase 2: Flesh and Fury

Once stripped of armor, the Icon of Sin’s flesh becomes exposed. But don’t celebrate just yet—he's angrier and deadlier in this final phase.

- Go All-In: Use your most powerful weapons (BFG, Unmaykr, etc.) and focus on staying alive. The window for error here is razor-thin.
- Keep Moving: At this point, the Icon of Sin’s attacks will hit like a freight train. Dash, jump, and grapple your way around the arena like your life depends on it (because, well, it does).

Taking down the Icon of Sin is a test of everything you’ve learned. Once you finally tear through him, sit back and soak in that sweet, demon-slaying victory.

Final Thoughts

Doom Eternal’s bosses hit hard and fast, but let’s not kid ourselves—that’s why we play. Every boss encounter is a spectacle, a chaotic symphony of blood, guts, and glory. While these fights can be brutal, each victory leaves you with a well-deserved sense of pride. Remember: you’re the Slayer. You’re built for this.

So, grab that Super Shotgun, slap on your Praetor suit, and get out there. The demons of hell aren’t going to slay themselves.