And there are loads of collectibles in this huge level. Again, collectibles are getting harder to find. You'll have to smash through cracked walls, explore hidden corners, and regularly check your map to find what you're looking for. There's a lot to miss, so let's go over all the secrets from start to finish.
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How collectibles work in DOOM Eternal:
There are many types of collectibles in: Auto Cards, Runes, Praetorian Points, Weapon Mods, Albums, Cheat Codes, Toys, Sentinel Crystals, and Sentinel Batteries. Every level has an Automap, but not all levels will have Albums, Toys, Cheat Codes, or Slayer Keys.
Basically there are a ton of different collectibles, and below I'll list where to find them all - in the Fallen from start of level to end. Levels in are much more linear, so as long as you follow along, it's easy to get all of the collectibles.
Guide to collection sites
M6: ARC Complex - Collection Locations:
Jouet - Mancubus: After descending into the elevator shaft, you will land in a hallway. Enter the room where the Mancubus comes out to find this guy.
Point had: To get a glimpse of the attack on the ARC complex from the giant windows, go down the hallway where another set of enemies will attack. Before jumping over the crashed ship, turn around and find a cracked showcase glass that you can break through.
Automap: At the Convention Center where you meet Cyber Mancubus for the first time. Found right next to the killer door on the upper floor, in front of the broken window that leads to the yellow pole.
Poor Mod: Located at the top of the Cyber Mancubus stairs, near where the glass shatters and reveals a yellow pole in the Convention Center.
Toy - Cueball: From the upper floor of the Palais des Congrès, go over the rugged walkway and pass yourself into a small room with two collectibles.
Sentinel battery: Located right next to the Cueball toy.
Slayer Key: From the destroyed sky, walk to the upper level of the Palais des Congrès, jump towards the soft wall between the two rough edges of the bridge. Go up and you can switch to that Slayer key.
Slayer Gate: Very close to the Slayer Key in the Convention Center. You'll find it on the top floor, across from the rugged bridge.
Cheat code - IDKFA: When leaving the main convention center you will have to swing on a yellow pole. In front of you, you will encounter enemies rising from the ground. Look in the hole to find this cheat.
Manuscript: At the top of the cheat, there is a large window with a computer terminal on the right. Use it to get that codex entry.
Poor Mod: Continue down the Codex corridor to find a cracked wall. Open it to reveal the path to this weapon mod.
Manuscript: Later you will have to jump from one building and descend into another. When you land, jump left over the rubble to find a cracked wall. Go up the stairs to find this codex.
Sentinel crystal: Exit the stairwell with the codex to reach a hidden room with this sentinel crystal.
Point had: Going up into the building, you will reach a hologram in front of an infernal knight. The point is right behind it. That's right before you jump in and get on the broken down plane.
Manuscript: On the second floor of the burning building where you will have to climb the giant staircase, you will find this Codex in the ruined main section on a ledge overlooking the secret encounter.
Point had: From the codex, double jump to this point next to a secret encounter.
Secret meeting: Found in the burning building, easily visible when you first enter the area. Go to the second floor and cross the space.
Toy - Whiplash: On the third floor of the burning building, look left for a small passage through the rubble.
Rune: Continuing into another burning building, you will need to descend into a small hole in the ground after meeting Mancubus. There is a Rune to collect directly after you've fallen.
Manuscript: In the restaurant where you will fight a huge horde of enemies - with a kitchen, there is a cash counter in the corner with a codex behind the desk.
Sentinel battery: After shooting the first turret and destroying the correct tentacle, you will find yourself in an underground facility. The battery is in the small office area in the hallway.
Manuscript: Going down the elevator to a boiler room, look in the corner behind the machinery.
Point had: When leaving the boiler room, you will come out in a corridor after the wreck. The point is just to your right.
Rune: After the Pinky Demon, the ground will crumble beneath you. Turn left and jump over the rubble to get this rune.
Sentinel battery: In the underground sewer filled with purple sludge, you will have to swing and rush to reach a small platform to exit the room. You can't miss this battery.
Manuscript: Leaving the purple sewage, you will reach a maintenance corridor filled with electricity. At the end of the hall, enter the small office and press the button inside. Then return to the hallway - the door is now unlocked.
Album - Quad Machine (Quake II): In the secret maintenance room unlocked from the desktop button, go down near the codex to find a lower area with an album hidden in the corner.
Secret meeting: In front of the album's hiding place, there is a secret meeting.
Album - Intro (Quake II): Once you destroy the two tentacles with the giant turrets, you will find yourself in a two-story parking lot. On the upper floor, there is an optional bedroom with a journal entry and a collector's item.
Point had: Just to the left of the parking lot exit, in a dead end corridor.