DOOM Eternal
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Icon of Sin (Final Boss) - How to Beat
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DOOM Eternal
Icon of Sin (Final Boss) - How to Beat

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Learn All Your Slayer Needs In This Beginner Guide

Read this DOOM Eternal guide to learn more about how to beat the final boss, Icon of Sin! Find out the demon's weakness, gameplay tips, how to beat, and more!

Table of Contents

Check Out the All Enemy List Here!

Icon of Sin - Weakness & Tips

Final Boss Has Two Stage Battle

Two Stage Battle

The Icon of Sin is the boss for Mission 13, Final Sin. This boss fight will be comprised of two parts. The first will have you breaking the boss' armor, while the second will have you finally killing the Icon of Sin.

Check Out the Final Sin Mission Here!

Break Armor & Body Parts to Deal Damage

Break Armor & Body Parts to Deal Damage

The Icon of Sin's fight will require you to destroy its armor and body parts. A body part will glow red when it is taking damage so if a body part stops glowing while you hit it, that means it's broken and you need to move on to the next part.

List of Armor / Body Parts You Need to Destroy

  • 1. Head
  • 2. Left Chest
  • 3. Right Chest
  • 4. Left Shoulder
  • 5. Right Shoulder
  • 6. Left Hand
  • 7. Right Hand
  • 8. Abdomen

Keep in mind that you can go about destroying these body parts in any order you like. There is no specific procedure to go about breaking the enemy's parts.

HUD Tracks Broken Parts

HUD Tracks Broken Parts

Your HUD can also serve as a useful guide to show you how many parts you've broken. You can check this on the left side of your screen.

BFG Can Easily Destroy Parts

BFG Can Easily Destroy Parts

The BFG 9000 is your best bet at quickly destroying body parts. Since the weapon's projectiles move slowly, you will need to lead your shots in order to successfully hit your mark. Thankfully, the arena has several ammo which you can pick up for the BFG.

Check Out the All Weapons List Here!

Portal Appears After Destroying Armor

Portal Appears After Destroying Armor

After destroying all of the Icon's armor, a green portal will appear. Going through this portal will immediately start the second phase of the fight. It is recommended that you stock up on ammo, health, and armor before passing through the portal.

Second Phase Is Similar to the First

Second Phase is Similar

The second phase will still have the same objective as the first phase: destroy the body parts. However, the arena is now more open, and more enemies will appear making the fight more hectic! Focus on moving around, and attack the Icon when the opportunity presents itself!

Icon of Sin - Attack Patterns & Features

Punches & Smashes

Punches & Smashes

The Icon of Sin will sometimes use its fists to punch or smash a side of the arena. Thankfully, this is obviously telegraphed by it winding up. When you see the boss winding up one of its arms, get to the other side of the arena quickly!

Projectile Attack

Projectile Attack

The boss will also use the pentagram on its head to let loose a number of fireball projectiles at your location. These do not home in on you so being on the move is enough to help you evade this attack.

Rune Projectile Attack (Second Phase Only)

Rune Projectile Attack

During the second phase of the fight, runes that have a large surface area will also emit from the pentagram. You will need to use dashes and jumps to maneuver around this attack.

Meteors (Second Phase Only)


Meteors will also start raining down from the sky. These projectiles are slow, and can be dodged easily by running or platforming to another location.

Get Behind Cover to Avoid Getting Hit

Get Behind Cover to Avoid Getting Hit

Some areas of the arena can also provide a safe haven for you when the Icon of Sin decides to launch projectiles at you. You can stay behind walls to break line of sight and keep safe as these projectiles do not penetrate through!

Douses the Arena In Fire

Douses the Arena in Fire

The Icon of Sin will raise its hands up and start spewing flames onto the arena. This will cover the lower part of the level on fire, and will damage you if you step on it. Move upwards and stay on the upper platforms until the fire extinguishes.

Summons Demons

Summons Demons

Several demons will also be present during this boss fight, preventing you from solely focusing on the boss. These demons can range from generic fodder enemies to heavy hitters such as the Cyber Mancubus!

Use the Crucible Blade To Kill Heavy Hitters

Use the Crucible Blade to Kill Heavy Hitters

The Crucible Blade is a great way for you to take care and control crowds of demons. You can actually use it multiple times to deal with heavy hitters as there are several charges which you can pick up that regularly spawn on the arena!

Use Enemies to Resupply

Use Enemies to Resupply

If you are starting to get low on either health, armor, or ammo, you can easily kill these demons to resupply and keep you going!

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