Discover all codex entries in DOOM: The Dark Ages with this complete guide. Unlock the Lore Nerd Trophy and dive deep into the game’s backstory and hidden lore.
Table of Contents
All Codex Entry Locations
While DOOM has always been more about fast-paced demon slaying than deep lore, DOOM: The Dark Ages proves that the franchise can do both. This time around, the story, worldbuilding, and detailed codex entries add a surprising amount of depth. If you’re hunting down every collectible, the 26 codex entries scattered across 22 chapters are a must—especially if you’re aiming for that Lore Nerd Trophy / Achievement.
Here’s a full breakdown of where to find each one:
All Codex Entry Locations in DOOM: The Dark Ages
Chapter 1
- Doom Slayer: Behind one of the four Demonic Portals, look for a climbable wall that leads to this entry.
- Village of Khalim: After dropping the red forcefield near the chapter’s end, find a climbable wall on your right. Codex is near some Sentinel soldiers.
Chapter 2
- Hebeth: After pulling a lever and entering a green-lit doorway, hop over crates to your left to reach a hidden area with the codex.
Chapter 4
- Sentinel Barracks: Just before the Dragon’s Den area, take a left path before the Sentinel Shrine to find this entry and some gold.
Chapter 5
- Deag Loric: After finding the Cycler, double back under the metal railing you dropped from to find the codex.
- The Holy City of Aratum: After grabbing the Super Shotgun, break a nearby metal cross, move a block, and circle back through a broken window to reach the codex down a hallway.
Chapter 6
- Siege – Part 1: Near the Atlan-Titan fight, jump on debris piles to grab this codex.
- Kreed Maykr: Near a Sentinel Shrine and shallow water, find a climbable wall with this codex (close to the Mancubus toy).
Chapter 7
- Siege – Part 2: Use the secret key to open a gate, defeat two shield enemies, and grab the codex.
Chapter 8
- Abyssal Forest: During the barracks section, find breakable vines on the right near a row of shield enemies. Codex is behind them.
Chapter 9
- Ancestral Forge: Near the spectral wolf statues, drop to a wooden platform to find it.
- King Novik: In the moving platforms section, spot a red cross above. Break it with your shield, then raise a platform and backtrack to reach the codex using jump boosts.
Chapter 10
- The Forsaken Plains: Near a Sentinel Shrine and a spiked falling plate, follow the gold trail to this codex.
- Prince Ahzrak: Use the secret key to access a gated area near the fallen Atlan. Codex is inside.
Chapter 12
- Sentinel Command Station: After the vent section, hug the right wall to find gold and this entry.
Chapter 14
- Spire of Nerathul: Found on a ledge near the drained water used to reach a Stasis Emitter.
- Serrat: Before activating the elevator with the green platform (point of no return), check the right side for a small path and the codex.
Chapter 15
- City of Ry’uul: During the portal activation sequence, find a ledge on one side of the map. Climb the wall above it to reach the codex.
Chapter 16
- The Witch: Look for a blue gear visible through a hole near the center of the map. Hit it to lift a grate and access the codex.
Chapter 17
- Temple of Lomarith: In the underwater section, swim into a nearby upturned shipwreck. The codex is inside.
Chapter 18
- Commander Thira: Found in a wall gap in the beast’s belly during the “Destroy the Organ” section. Take the upper route and push through the stomach acid to reach it.
Chapter 19
- Harbor of Souls: Out in the open to the left of the main path. Super easy to spot.
- Hell Priests: After the moving platforms and flame traps, turn around at the point of no return and follow the left path.
Chapter 20
- Resurrection: Behind the key door near the yellow key ledge. Also where the Cosmic Baron toy is hiding.
- Commander Valen: After mounting the dragon and landing on the Kreed ship, turn around and check the edge of the landing pad.
Chapter 22
- Marok: After charging through the green gate, don’t jump into the battlefield. Instead, follow the right-hand path to find this final codex. Collecting it (along with the others) unlocks the Lore Nerd Trophy / Achievement.
If you’re all about lore, secrets, and 100% completion, these codex entries are the way to go. Plus, some of the backstory and world details they unlock are actually pretty awesome.
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