Doom: The Dark Ages Chapter 10 Secret Key & Secret Door Locations Guide
Here’s where to find the Secret Key in Chapter 10 of Doom: The Dark Ages, and how to unlock all three secret doors hidden throughout the Forsaken Plains.
Doom: The Dark Ages Chapter 10 Secret Key & Secret Door Locations
Welcome to Chapter 10: Forsaken Plains, where Doom: The Dark Ages goes full Hell. It’s the first level set entirely in the infernal realm, with three separate wings branching out from a central Atlan hub. While it’s one of the more visually chaotic chapters, the central layout actually makes it easier to explore—especially if you’re hunting down that elusive Secret Key and all three secret doors it unlocks.
Let’s break down exactly where to find the Chapter 10 Secret Key and what you’ll get for finding each of the three secret doors.
🔑 Chapter 10 Secret Key Location
You won’t need to stray too far from the main path to grab the key. Here’s how to get it:
- Play through the level normally until you get past the gate and reach the open area with the downed Atlan.
- From here, go left down the path—you’ll spot the first secret door, but ignore it for now.
- Keep going until you see the Secret Key hologram floating outside a tall tower. You can’t reach it from the ground.
- Go around to the back of the tower and look up to spot a green grapple point.
- Throw your Saw Shield at it, then hit the input again to launch yourself up.
- Grab the Armor pickups, then look for superheated metal across the gap—throw the Saw Shield again to create a path.
- Follow the Gold pickups, dodge fire traps, and kill the armored demon inside.
- At the end of the hall, step outside and climb the ledge to your right.
- Loot the Gold Chest, turn right again, and leap across the gap to reach a walkway.
- Drop down into the tower to claim the Secret Key.
🚪 All Secret Door Locations in Chapter 10
With the key in hand, you can now unlock all three purple-glowing secret doors scattered around the Forsaken Plains:
🔥 Secret Door #1 – Ruby & Combat Arena
- Location: Just to the left of the downed Atlan, in a sunken area below cliffs.
- Landmarks: A Sentinel statue holding a Ruby is right outside.
- What’s Inside: A combat arena where you must defeat waves of demons. Finishing the fight removes the red barrier so you can claim the Ruby.
🪙 Secret Door #2 – Ruby, Gold & Fire Traps
- Location: Near the first Hell Cannon.
- How to Get There: After Shield Charging through the cannon to destroy it, continue forward toward the main objective—you’ll run right into it.
- What’s Inside: Lots of Gold pickups, another Ruby, and deadly fire traps to dodge.
📖 Secret Door #3 – Gold & Codex
- Location: In a courtyard tucked behind the Atlan, near the middle of the level.
- How to Find It: From the start of the level, face the Atlan and go around the back. Look for a trail of Gold pickups that lead you to it.
- What’s Inside: More Gold and the Prince Ahzrak Codex entry.
✅ Final Tips
- The key and all doors are easy to miss if you’re rushing, so slow down and explore each wing of the level thoroughly.
- Secret doors are always marked by that distinct purple glow, so keep an eye out.
- These areas are well worth the detour, with upgrade materials, lore entries, and bonus loot.
With the Secret Key and all three secret doors handled, you’re one step closer to mastering Doom: The Dark Ages. Hell has nothing on a well-prepared Slayer.
Related Article:
- How to Get Past the Teeth Door in DOOM: The Dark Ages (Chapter 18 Secret Guide)
- How to Open the Lava Door in DOOM: The Dark Ages (Chapter 2 Secret Area Guide)
- All Codex Entry Locations in DOOM: The Dark Ages (Complete Lore Guide)
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