Doom: The Dark Ages 12th level, Sentinel Command Station, contains three collectibles for you to find. Collectibles in Doom: The Dark Ages consist of codex entries, toys, and weapon skins hidden throughout most levels in the game. There is a built-in tracker on the map screen, which lists the total number of collectibles and will mark down any you find.

Check out our Doom: The Dark Ages Collectibles Guides Hub for links to guides for every level.

Collectible 1 – Sentinel Command Station Codex

At the very start of the level, right after dropping down from the vents, instead of taking a left at the end of the hall, take a right into a small cave with a fire in it. The codex page is in there.

Collectible 2 – Nightmare Chainshot Skin

Still near the start of the level, you will enter a command center and be directed to jump down a ledge outside. In the command center, you can find a wooden wall to break through with your shield. Inside, jump up the ledge to collect the skin.

Secret Key Location

Continue all the way until you get the Auto Turret Rune. When you grab it, turn around, and a launcher will send you back up the vent you just jumped down. There is a ledge with a gold chest, and across from that is a wall you can dash into. Follow the vent into a room, which contains the secret key.

Collectible 3 – Kreed Maykr Toy

Off the main plaza with the statue, you can head into a nearby room with an upgrade shrine. Inside is a secret, key-locked room, and just inside is the collectible.