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Doom Eternal: Walkthrough & Boss Guide

By ParryStack·Updated Oct 2026·🗺️ 7 steps · ⚔️ 5 bosses

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📋 In This Guide
  1. Main Story Walkthrough (7 steps)
  2. Boss Guides (5)

🗺️ Main Story Walkthrough

Tick off each step as you go — your progress saves locally, no account needed.

Step 1 of 7
About this guide

This is a condensed overview of DOOM Eternal's campaign structure, story and main boss fights, not a full mission-by-mission walkthrough. The mission list and story follow Wikipedia and the Shacknews and PowerPyx mission lists; boss notes are limited to what the Pocket-lint, Shacknews and Ludo.guide boss pages describe. Where the sources do not say which mission something happens in, this page does not guess. Spoilers follow.

Step 2 of 7
Campaign structure: 13 missions and the Fortress of Doom

The campaign runs through 13 missions in this order: Hell on Earth, Exultia, Cultist Base, Doom Hunter Base, Super Gore Nest, Arc Complex, Mars Core, Sentinel Prime, Taras Nabad, Nekravol, Nekravol – Part II, Urdak and Final Sin. Between missions you return to the Fortress of Doom hub, which is not counted as a mission in the mission select. The Ancient Gods, a two-part story expansion, is separate from these 13 missions.

Step 3 of 7
The core combat loop

According to Wikipedia, the game is built around three resource loops: stagger an enemy and finish it with a Glory Kill to restore health, use the chainsaw to make enemies drop ammo, and ignite enemies with the shoulder-mounted flamethrower to refill armor. The Blood Punch, recharged by accumulating Glory Kills, is a strong melee attack that destroys enemy armor. The Super Shotgun has a Meat Hook that pulls you toward an enemy. The BFG and the Crucible Blade can only be refilled at combat arenas, so use them deliberately.

Step 4 of 7
Story outline: the three Hell Priests

Set in 2163, the story has the Doom Slayer hunting the three Hell Priests, Deag Nilox, Deag Ranak and Deag Grav, who serve the Khan Maykr. According to Wikipedia he kills Nilox on Earth, then Ranak in an Arctic citadel, and then learns, after uploading Dr. Samuel Hayden's mind into his fortress, that Grav is hiding on Sentinel Prime. The only way there is a portal in the lost city of Hebeth in Mars' core, so the Slayer travels to the Martian moon Phobos and uses the BFG 10000 to shoot a hole in Mars. The Doom Hunter fight is described as guarding Deag Ranak (Pocket-lint), and the Gladiator is the guardian standing before Deag Grav in the Sentinel Prime arena.

Step 5 of 7
Sentinel Prime: the Gladiator arena

Sentinel Prime is the eighth mission and ends with the Gladiator fight that stands between you and Deag Grav. Ludo.guide describes the route as a tunnel of caged demons with armor, ammo and health pickups near the end, followed by a cutscene and the boss arena. The Gladiator boss fight is its centrepiece. See the Gladiator entry below.

Step 6 of 7
Slayer Gates and collectibles

Slayer Gates are optional, purple-marked, very hard combat encounters. Clearing a Slayer Gate gives an Empyrean Key; with all six keys you can unlock the secret Unmaykr weapon in the Fortress of Doom (PowerPyx). Other upgrades are separate: Praetor Suit points (tokens) unlock passive suit upgrades such as grenade upgrades, and Sentinel Crystals increase health, armor and ammo capacity. Slayer Gates do not award Praetor tokens or Sentinel Crystals. This guide does not list which mission holds which Slayer Gate.

Step 7 of 7
Khan Maykr and the Icon of Sin

The Khan Maykr is the mastermind of the invasion and is fought some time after the Gladiator. The Icon of Sin is the final boss, fought in an arena (Pocket-lint) in the closing stretch of the story; Wikipedia states the Slayer kills the Icon on Earth after the Khan Maykr plans to resurrect it. Details of both fights are in the boss entries below.

⚔️ Boss Guides

⚔️

Doom Hunter

Weakness
Only the plasma rifle can break its shield; the shield regenerates, then destroy the sled to reduce its mobility
Recommended Gear
Plasma rifle for the shield; heavy cannon with precision bolt or rocket launcher with remote detonate for the sled (Pocket-lint)

Attacks and strategy

Pocket-lint describes the Doom Hunter as guarding Hell Priest Deag Ranak. It rides a hovercraft-like sled and attacks with tracking rockets, an energy shield and a chainsaw. Break the shield first (only the plasma rifle can, and it regenerates, so act quickly), then destroy the sled to cut its mobility. Use ramps and height changes to keep your distance. After the first Glory Kill a hole opens to an ice arena with two more Doom Hunters.

⚔️

Marauder

Weakness
Only vulnerable when he charges with glowing green eyes
Recommended Gear
Ballista shot, then switch to the Super Shotgun while he is stunned; avoid the BFG and rocket launcher (he resists super weapons and dodges slow shots)

Attacks and strategy

Per Pocket-lint, the Marauder throws an axe from long range, uses a shotgun up close, blocks with a shield and is accompanied by a fire-dog. Stay at mid-range, dodging side to side with dashes and jumps, and attack when he charges with glowing green eyes. The sources used here do not say which mission he first appears in.

⚔️

Gladiator (Sentinel Prime)

Weakness
Shielded phase: fire when the eyes on his shield glow green; unshielded phase: rockets with lock-on or BFG ammo
Recommended Gear
Plasma rifle for the shielded phase; rocket launcher or BFG once the shield is gone; shotgun sticky bombs as a backup (Ludo.guide, Pocket-lint)

Attacks and strategy

The Gladiator uses a shield, two spiked flails on chains and a whip, and periodically spawns fodder and heavy demons. In phase one, strafe to keep him in sight; when the eyes on his shield glow green, fire and dash sideways. Deplete his health and perform a Glory Kill to destroy the shield, which also restores his health for phase two. In phase two he is faster, jumps and slams his clubs (including a V-shaped slam that blocks your path), and spins his weapons in a yellow shield that reflects shots, so fire when it lowers. Once his shield is down you can Blood Punch him; finish with a Glory Kill.

⚔️

Khan Maykr

Weakness
Her shield must be shot down first; then use the Meat Hook to reach her and Blood Punch (about six punches)
Recommended Gear
Ballista until she is stunned and glowing green; Super Shotgun with the Meat Hook for the Blood Punch; heavy cannon precision bolt for the Maykr Drones

Attacks and strategy

Pocket-lint describes a shielded flying boss with gold projectiles, a purple blast that can knock you off the platform and a fire-trailing beam. Shacknews adds that lasers fall from the sky and lava-like fire covers parts of the arena, so stay on safe ground. Shoot the shield down, then use the Meat Hook to reach her and Blood Punch; each cycle removes only a slice of her health, so repeat. Maykr Drones take more than one chainsaw fuel to kill and chainsaw ammo refills do not work in this fight; shoot the drones in the head with the heavy cannon for ammo and health.

⚔️

Icon of Sin

Weakness
Eight armor pieces (head, chest, torso, arms) must be removed first; then damage the exposed flesh
Recommended Gear
BFG at his center mass in phase one; Ballista, rocket launcher and chaingun on his hands; the Crucible sword for the final blow

Attacks and strategy

Pocket-lint describes the final fight as a two-phase arena battle. In phase one, use the BFG on his center mass from high vantage points reached through portals and launchpads, switching to the Ballista and rocket launcher as the fight goes on and the chaingun on his hands, until all eight armor pieces are gone. In phase two, damage his exposed flesh while dodging flames, projectiles and demons. Crucible sword pieces are scattered across the arena; after the Icon collapses, use the sword to deliver the final blow.

Sources & fact-check

Release facts, mechanics and boss details on this page were checked against these sources on 12 October 2026. Spotted an error? Tell us.

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