The developers of Doom Eternal poured much love and care into the game considering how many Easter eggs have been discovered since its launch. Some of these secrets are on your space fortress ship, the Fortress of Doom.
If you’re not sure how to find them, we can help with that. The Fortress of Doom serves as the central hub between missions, so you’ll already spend a lot of time there and don’t have to make a special trip. Keep on reading to find out the secrets’ details.
The Fortress of Doom’s Secrets
As there are many secrets, we’ll divide them into several subsections. Some secrets have prerequisites, which may also be unlockable items or secrets themselves.
Opening the Locked Rooms
When you first access the Fortress of Doom, you’ll likely notice the locked areas. Inserting two Sentinel Batteries into each slot will open up the way to the rewards within.
There are two main ways of collecting Sentinel Batteries. The easiest method is to complete each mission’s challenges. Other batteries are in the levels themselves, and you must find them.
Some of these Sentinel Batteries are already visible, while others are tucked into obscure corners and areas. Through lots of exploration and parkour, you’ll likely find the battery within a mission.
The rewards within these locked rooms are:
- Classic Marine Armor Skin
This armor is a copy of the first-ever Doom suit. Its simple design is nostalgic and has become iconic in gaming history. Once you equip it, you’ll look like the original Doomguy, but in next-generation graphics.
- Praetor Armor Skin
The Praetor Suit is The Slayer’s original suit. It was introduced in 2016 when the series received its reboot. If you like how he looked in the previous game, snagging this armor will let you relive the good old days.
- Sentinel Armor Skin
You get Sentinel Armor after losing to bosses three times, as it makes the fights easier. However, if you like its aesthetic, you can find it within the Fortress of Doom, too. This armor is only a skin and thus doesn’t offer the benefits of decreased damage the way the Sentinel Armor does.
- Two Mod Bots
Mod Bots let you modify a single weapon in your arsenal. There are two in your ship, and you need to unlock their rooms first before getting them.
- Four Praetor Suit Tokens
To make your Praetor Suit extra effective in battle, you can use these Tokens to unlock abilities. Four of them are hidden in the Fortress of Doom.
- Two Sentinel Shards
Tokens are for your suit’s upgrades, but Sentinel Shards serve to increase The Slayer’s armor, ammo, and health stats. Collect them to survive brutal hordes longer.
The Two Cheat Codes
There are two locked areas with cheat codes in the Fortress of Doom. One is at the right side of the spaceborne structure, while the other is at the ship’s center. Once you access the areas, there are two cheat codes to find, one in each area.
To access the first area, you must perform the following actions:
- Head to where you unlocked the Praetor Suit.
- Find an exit at the left wall.
- Fall through the hole and turn around.
- Find a small gap where the cheat code for All Runes is.
The other cheat code is obtained this way:
- Get Samuel Hayden and The Crucible sword.
- Head to where the blade is floating.
- Aim to the top-right corner.
- Shoot the tiny red dot.
- Go through the vent that opens.
- Jump boost and land in front of the Fully Upgraded Suit cheat code.
Games Within Games
Heading to The Slayer’s bedroom lets you access an old PC. Once you beat the campaign and unlock all cheats, you can play the original Doom. Doom II is also playable after you enter “FLYNNTAGGART” in the terminal. If you grew up playing these games, this is a huge nostalgia trip.
Uncover Them All
The secrets we covered above are only for a small part of Doom Eternal. However, they’re all great to have, and you’ll find yourself hunting down Sentinel Batteries in due time. The best part is that there are even more secrets to discover elsewhere.
Which secret is your favorite? Have you found all the secrets in Doom Eternal yet? Let us know in the comments section below.
