Doom: The Dark Ages – All Secret Key Locations and Uses in Chapter 22

Still hunting for secrets in the final chapter of Doom: The Dark Ages? Here’s where to find the secret key in Chapter 22 and every place you can use it.

Chapter 22 Secrets Guide – Doom: The Dark Ages

Even though it’s the final chapter, Chapter 22 of Doom: The Dark Ages isn’t just a big boss battle and the end credits. You’ve still got more demons to rip through—and more secrets to find before wrapping things up. Whether you’re chasing that last Ruby for a weapon upgrade or just want to grab every collectible before finishing the fight, Chapter 22 delivers.

One major item to look out for is the Secret Key, which unlocks several hidden areas throughout the chapter. Here’s where to find it and how to use it.

🔑 Where to Find the Secret Key in Chapter 22

You won’t get access to the Secret Key right away. First, progress through the chapter until you acquire the blue skull. After that, keep following the waypoint until you reach an elevator.

• Ride the elevator up.
  
• Once at the top, if you’re facing the waypoint direction, turn around.
  
• Behind you, there’ll be a path lined with gold—follow it.
  
• The Secret Key will be sitting at the end of the trail.
  

Make sure to grab all the nearby gold before you continue.

🔓 Where to Use the Secret Key (All Key Door Locations)

There are several gates in this chapter that require the Secret Key. Here’s where to find them, and what each one holds:

🔁 1. Shortcut Door (Right After Picking Up the Key)

• Literally right in front of you after grabbing the key.
  
• Unlocks a shortcut back to the main path, in case you want to return or revisit areas before moving on.
  

🪙 2. Left Courtyard Door – Life Sigil & Ahzrak Toy

• After opening the shortcut, drop into the courtyard below.
  
• Head left to a second locked gate.
  
• Inside:
  
  • Gold
    
  • A Life Sigil
    
  • A drop-down area that leads to the Ahzrak Toy collectible
    
  • Don’t forget to grab the gold in all four corners before you leave.
    

💎 3. Courtyard Left Door #2 – Ruby Location

• From the courtyard, keep going left again and you’ll find another gate.
  
• Behind it:
  
  • More gold
    
  • A Ruby, perfect if you need just one more for that final upgrade
    

🗝️ 4. Wraithstone Room – North Hallway Gate

• Backtrack to the door that required the blue skull earlier.
  
• Proceed north down the hallway.
  
• Look to the left to find another Secret Key gate.
  
• Inside:
  
  • A Wraithstone
    
  • A short hallway blocked by gates on both sides. Inside is a cache of gold.
    

💠 5. Hidden Chamber Below Key Location – Health/Shield Orb

• Go underneath the hall where you found the Secret Key.
  
• Look for a brazier next to a locked gate.
  
• Inside:
  
  • A blue orb that fully recharges your health and shield
    
  • A final stash of gold
    

🧠 Final Tip

If you’re chasing full completion:

• Make sure to open all Secret Key doors before moving to the final boss.
  
• Use the shortcut opened by the first gate to circle back quickly.
  
• Keep an eye out for gold tucked in corners—easy to miss when you’re rushing into the next demon brawl.
  

And that’s it—every Secret Key use in Chapter 22! Now you can head into the final fight geared up, fully stocked, and with all your secrets collected. Rip and tear, one last time.

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