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Final Sin
The Icon of Sin is now on earth, with the Khan Maykr defeated, he is the last obstacle standing in your way. Using the portal you opened on Urdak, the Doom Slayer returns to earth one last time, Crucible in hand, to take down the Icon of Sin.
Destroy the Icon of Sin
This mission is mainly focused on following the Icon of Sin as he rampages through a city on earth trying to stop him before he gains too much power.
You will immediately be faced with a combat encounter on the first rooftop you start on. Nothing too difficult, just take everything you have learned so far, stay moving, and slay some demons. Expect to see every type of demon you have faced in the campaign, this fight specifically will end with a Tyrant. Just aim for his arm cannon with the plasma rifle and use the lock on mod with the rocket launcher to deal massive damage.
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Then a doom hunter will appear, but you should be a pro at taking those down by now. Once the demons are cleared out a few more fodder demons will appear for any ammo and armor out of a newly broken section of wall. Go through there and walk up the metal stairs to the end marked by your HUD. At the edge you will see an opening in the opposite building you can jump too.
Continue to follow the marker, there will be some demons along your path but they will mostly be there for resources. wrap around the building you jumped into to the grab wall around the corner to reach the upper level.
Continue to follow the path on the building, slaying demons along the way. untill you reach the end where you will find another jump to reach the next building. You will eventually reach an elevator with a grab wall in it to continue up the building.
The icon of Sin will walk through the bridge cutting off your easy access to the next building over, slay the demons and walk to the edge where the bridge was destroyed. You will see a scaffolding you can use to reach the next building.
This building will have a combat encounter with a buff totem. It is located to left, through the door a pinky destroys in the hallway to the right.
Once you take out the buff totem clear out all the demons in the area since they will now be weakened. You can continue to make your way up to the building continuing to fight demons along the way. The markers here are very clear, there will be some minor platforming but after this point you are very close to the final boss.
You will have one last final gaunlet of enemies up a building, ending with the worst enemy of them all, a Marauder. The next area will have some armor and a grab wall that will lead you to the final arena.
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SPOILER ALERT: Spoilers for the final boss of Doom Eternal are below, proceed with caution!
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Icon of Sin Boss Fight
There are two phases to the Icon of Sin Boss Fight, the final Fight of Doom Eternal. In the first phase, the icon of sin will be covered in armor you will need to destroy to deal any real damage.
There are 8 pieces of Armor:
- Head
- 2 on each arm
- 2 chest pieces
- 1 on each shoulder(2)
- Stomach
The Chain Gun is the easiest way to deal damage to the Icon of Sin, but there is also alot of ammo for the BFG lying around, save it to deal damage to the chest, as that is the easiest part to hit with it.
The best strategy to take out the armor pieces is to focus on the arms first, then the head and chest. The arms will be the hardest to hit because he will constantly be using them to attack the building you are in. there will be demons spawning but they are easily avoidable and should only be dealt with if you feel overwhelmed or need resources. There are plenty of pickups for your crucible around so use your sword to take out any larger demons you just don't feel like dealing with.
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The Sticky Grenade mod can deal massive damage to the armor as well if you manage to get close enough to the Icon of sin using the various jump pads scattered in the arena. This is the easiest way to destroy the head and chest.
Once you drain the life bar at the top of the screen and have destroyed all eight armor pieces the Icon of Sin will spawn a portal, Follow him to phase two.
Phase two functions the same as phase one, the area is just less vertical than the first phase. This makes some of the attacks harder to dodge, but your plan of attack for phase two should be the same as phase one, focus on the arms, leave the bigger targets in the center like chest and head for last.
As you destroy parts of their body, The Icon of Sin's bones and flesh will be exposed, letting you know to move on to the next area. There will be less fodder demons this time around, but still enough to annoy you and give you some resources.
Once you destroy every part, the Icon of Sin is Defeated, and the Doom slayer will lodge his crucible in the Titan, saving Humanity.
You have completed the Doom Eternal Campaign! Congrats!
You will now be transported back to the Fortress of Doom, allowing you to fill in any sentinel cores you earned the last few levels, or return to any previous missions to see anything you missed.
Returning to a mission to find skipped collectibles? be sure to use IGN's Collectibles for Doom Eternal for all those hidden surprises!