Finding secret areas and collectible items has become a staple of the Doom series, and that hasn't changed in Doom: The Dark Ages. In fact, there are actually far more to find, with mission challenges sending you in search of hidden areas, as well as the usual trinkets to be on the lookout for.

Below you'll find the Doom: The Dark Ages secrets and collectibles locations for each mission, sorted into chronological order so you won't miss a thing. While some of the rewards are just for fun, like the iconic demon toys, others are valuable resources, especially on higher difficulties: things like rubies, gold, and Demonic Essence to upgrade your stats.

Doom: The Dark Ages secrets and collectibles locations

Almost every level has secrets and collectibles in Doom: The Dark Ages, though there are a few exceptions, such as Barrier Core and From Beyond which don't have secrets. And the missions that do have secrets vary in size quite a bit, with some only having a handful and others having a whole shopping list of things to uncover.

Below are all Doom: The Dark Ages missions with secrets in order, plus every secret I've found so far. I'll add the other missions once I've uncovered the secrets and collectibles for those:

1. Doom: The Dark Ages Village of Khalim secrets
2. Doom: The Dark Ages Hebeth secrets
3. Doom: The Dark Ages Sentinel Barracks secrets
4. Doom: The Dark Ages The Holy City of Aratum secrets
5. Doom: The Dark Ages Siege - Part 1 secrets
6. Doom: The Dark Ages Siege - Part 2 secrets
7. Doom: The Dark Ages Abyssal Forest secrets
8. Doom: The Dark Ages Ancestral Forge secrets
9. Doom: The Dark Ages The Forsaken Plains secrets
10. Doom: The Dark Ages Hellbreaker secret

After spending over 20 hours tracking down secrets and collectibles, one thing that stuck out to me is that there are a lot of resources you're missing out on if you're not diligent. For example, many rubies and wraithstones aren't in secret areas but are nonetheless hidden. Likewise, most weapon skins aren't earned from exploring. However, you'll still need to put in the work to find items like these, as many are handed out from activities like gore pillars or mission challenges.

Village of Khalim (Chapter 1)

• 6x Secrets
• 2x Codex entries
• 2x Collectible toys
• 1x Weapon skin

In this opening level, the Doom Slayer is shot down to the Village of Khalim like an ODST to reinforce the Sentinels. Despite it being somewhat of a tutorial mission, easing you into all the new mechanics in The Dark Ages, there's still plenty to find.

Hebeth (Chapter 2)

• 9x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Health
• 210 Gold

Prince Ahzrak's search for the Heart of Argent leads him to attack the Sentinel's defences, so the Doom Slayer is called to duty once again. As you'd expect from the second mission, it's slightly larger than the debut chapter, but it's still holding back on secrets.

Sentinel Barracks (Chapter 4)

• 6x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Armour
• 212 Gold
• 2x Ruby
• Rip and Tear challenge: Kill 40 demons (gold)
• Plunderer challenge: Find 150 gold (gold)
• Prize Fighter challenge: Execute a three-hit Melee Combo three times (gold)

Chapter 3, Barrier Core, doesn't have any secrets to find (not even currency), so your next shot comes with Sentinel Barracks, which is much bigger than previous missions. You're also introduced to mission challenges here, which give you additional rewards, on top of those found in the level, if you can beat them.

The Holy City of Aratum (Chapter 5)

• 9x Secrets
• 2x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Armour
• 1x Demonic Essence - Ammo
• 240 Gold
• 2x Ruby
• Countercult challenge: Dispatch all of the cultist circles (ruby)
• Layover challenge: Dismount the Dragon at two secret landing zones (gold)
• Cat and Mouse challenge: Chase and destroy three hell fighter ships (gold)

With Prince Ahzrak closing in on the Heart of Argent, the Doom Slayer mounts up, treating you to your first dragon-riding mission. Unlike the titan missions, you're free to leave the dragon and explore, so there's heaps to find, including the secret dragon landing zones for the Layover challenge.

Siege - Part 1 (Chapter 6)

• 11x Secrets
• 2x Codex entries
• 2x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Armour
• 1x Demonic Essence - Ammo
• 513 Gold
• 4x Ruby
• Immovable Object challenge: Parry ten hellknight attacks (gold)
• Unstoppable Force challenge: Strike demons with the flail 25 times (gold)
• Siege Breaker challenge: Destroy four artillery cannons (Reverent Combat Shotgun weapon skin)

Siege Part 1 is where the treasure hunting gets serious, simply due to how large the map is and how many secrets there are to find. If you track down all the rubies, you'll be well on your way to upgrading your favourite weapons.

Siege - Part 2 (Chapter 7)

• 9x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Demonic Essence - Health
• 183 Gold
• 2x Ruby
• Roundhouse challenge: Hit demons ten times with a fully charged chainshot (gold)
• Exterminator challenge: Kill three or more fodder demons with a single shield throw five times (Reverent Shredder weapon skin)

Ahzrak's demon horde breaches the walls of the Sentinel fortress, leaving the Doom Slayer to fight his way through. In sharp contrast to Siege Part 1, Part 2 is much more streamlined—though there are still plenty of well-hidden secrets to dig up.

Abyssal Forest (Chapter 8)

• 11x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Demonic Essence - Armour
• 250 Gold
• 2x Ruby
• Ghost Buster challenge: Parry revenant projectiles (ruby)
• Knockout challenge: Execute four Dazed demons with shield charge (gold)
• Bone Collector challenge: Collect 100 ammo loot drops from melee striking demons (gold)

The Doom Slayer heads into the woods to find Thira, and as you'd expect from a forest in a Doom game, it's hellishly dark and misty, making finding all the secrets quite a challenge. Luckily, most of the secrets are concentrated in one area in particular, so it's not as hefty a task as it sounds.

Ancestral Forge (Chapter 9)

• 9x Secrets
• 2x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Health
• 1x Demonic Essence - Ammo
• 230 Gold
• 2x Ruby
• 1x Wraithstone
• Nothing But Nade challenge: Score ten direct hits with the Grenade Launcher weapon (gold)
• Sawed Off challenge: Lock down demons with the shield saw for 20 seconds total (gold)
• Seven Secrets challenge: Discover seven secret areas (Reverent Accelerator weapon skin)

With Thira's help, the Doom Slayer restarts the ancient forge, once again giving you an open area to explore. This mission is also the first time you'll get access to wraithstone, which is required to fully upgrade weapons, making it a particularly important secret to complete.

The Forsaken Plains (Chapter 10)

• 10x Secrets
• 2x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Health
• 1x Demonic Essence - Armour
• 1x Demonic Essence - Ammo
• 230 Gold
• 3x Ruby
• 1x Wraithstone
• Rocket Man challenge: Cause damage to five or more demons with a single Rocket Launcher shot five times (gold)
• Exterminator challenge: Destroy two gore nests (Reverent Pulverizer weapon skin)
• Fault Line challenge: Affect 25 demons with the ground fissure shield rune (gold)

The Doom Slayer is sent on a one-man mission into hell, where previous Sentinel offensives failed, though you'd expect nothing less from the titular badass. It turns out that demons love hiding secrets for you just as much as the Sentinels, so you've got a shopping list to track down, including more upgrade materials, each type of Demonic Essence, and each type of collectible item.

Hellbreaker (Chapter 11)

• 1x Secrets
• 1x Collectible toys
• 1x Demonic Essence - Armour
• 85 Gold
• Elusive challenge: Execute a perfect dodge five times (gold)
• Dispersion challenge: Damage three or more demons with a single holy swarm volley five times (gold)
• Crushinator challenge: Damage two or more titans with a single stomp attack (gold)

Besides Barrier Core, Hellbreaker is the shortest mission in Doom: The Dark Ages, though don't underestimate it: the one secret collectible it does have is surprisingly hard to find.

Sentinel Command Station (Chapter 12)

• 9x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Health
• 177 Gold
• 1x Ruby
• 1x Wraithstone
• Punching Bag challenge: Strike a battleknight with a melee attack ten times (gold)
• Wait for It challenge: Kill 10 demons with explosive barrels (ruby)
• Skeleton Key challenge: Open two secret key doors (gold)

Sentinel Command Station is a very traditional Doom mission, sending you through a facility of twisting corridors and elevators. While its list of secrets and collectibles is rather restrained, it's quite easy to accidentally progress too far ahead and block routes, requiring you to reload a checkpoint or replay the mission to grab everything.

From Beyond (Chapter 13)

• Deft Dragon challenge: Perform a perfect dodge five times (gold)
• Veteran Pursuer challenge: Chase and destroy two hell fighter ships (Reverent Impaler weapon skin)

From Beyond is a nice and quick mission with very little to tick off. In fact, there are no secrets to find in the level itself—but there is the Veteran Pursuer challenge that rewards a unique skin.

Spire of Nerathul (Chapter 14)

• 11x Secrets
• 2x Codex entries
• 2x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Health
• 1x Demonic Essence - Ammo
• 359 Gold
• 3x Ruby
• 2x Wraithstone
• Heart Harvester challenge: Kill all leader demons (gold)
• Master Blaster challenge: Damage demons with 250 auto turret shots (gold)
• Expert Stalker challenge: Chase and destroy two hell fighter ships (gold)

Thira and the Kreed are pulled into an unknown dimension, and (to no one's surprise) the Slayer follows in pursuit. Giving you yet another open zone to explore on dragon-back, Spire of Nerathul is one of the most confusing missions in terms of secrets and collectibles. There are lots of landing zones, including hidden ones, making it tricky to track down what you're missing.

City of Ry'uul (Chapter 15)

• 10x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Demonic Essence - Health
• 1x Demonic Essence - Armour
• 182 Gold
• 2x Ruby
• 1x Wraithstone
• Heads Up challenge: Parry cacodemons (gold)
• Face Cracker challenge: Damage 25 demons with the dreadmace (Reverent Super Shotgun weapon skin)
• Torrent challenge: Stun eight or more demons with a single heaven splitter storm three times (gold)

The Cosmic Realm lives up to its name, packed full of mindbending areas, portals, and the like, which can make getting that prized 100% rating quite a challenge. You'll also need to use the dreadmace—my least favourite melee weapon—to complete the Face Cracker challenge.

The Kar'Thul Marshes (Chapter 16)

• 5x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Demonic Essence - Armour
• 1x Demonic Essence - Ammo
• 188 Gold
• 1x Ruby
• 1x Wraithstone
• Hunter challenge: Destroy all five of the wolf statues in the swamps (Reverent Cycler weapon skin)
• Roundup challenge: Kill 20 or more demons with a single BFC shot (gold)

While you're still in the Cosmic Realm tracking down Thira, I found myself preoccupied with finding all the secrets. It's a relatively small mission but it features some of the best secrets in the entire game, including a puzzle cube and an infinitely-looping hallway to wrap your head around.

Temple of Lomarith (Chapter 17)

• 9x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Ammo
• 194 Gold
• 2x Ruby
• 1x Wraithstone
• Swashbuckler challenge: Collect all three rubies and wraithstones (gold)
• Water Logged challenge: Find three underwater secrets (Reverent Chainshot weapon skin)

Doom: The Dark Ages' seventeenth mission amped up the challenge quite a bit, with some nicely hidden secrets and collectibles that had me searching high and low. Taking place in the Cosmic Realm yet again, you're also treated to some of the best environments of the campaign.

Belly of the Beast (Chapter 18)

• 6x Secrets
• 1x Codex entries
• 1x Collectible toys
• 1x Demonic Essence - Armour
• 153 Gold
• 1x Ruby
• Swallowed Whole challenge: Complete the optional encounter in the stomach (gold)
• Toe-to-Toe challenge: Parry cosmic baron demons ten times (Reverent Grenade Launcher weapon skin)

Unfortunately, the name of this mission isn't hyperbole: the Slayer is consumed by the Old One. Despite being eaten, your hunt for secrets doesn't end here. In fact, the following two missions are among the largest of the bunch.

Harbor of Souls (Chapter 19)

• 10x Secrets
• 2x Codex entries
• 1x Collectible toys
• 1x Demonic Essence - Health
• 1x Demonic Essence - Ammo
• 294 Gold
• 1x Ruby
• 1x Wraithstone
• Berserker challenge: Kill 75 demons while under the influence of berserk (ruby)
• Dragon Hoard challenge: Smash open three gold chests (gold)
• Executioner challenge: Perform an execution on 25 demons (gold)

Ahzrak has managed to transform himself using Thira's power, making it the Doom Slayer's problem once more. Before stopping him though, you've got a laundry list of secrets to find in this mission, including a bonus ruby for completing the Berserker challenge. Thanks to the Berserk status in this mission, it's also one of the best missions to farm mastery challenges for gold weapon skins.

Resurrection (Chapter 20)

• 12x Secrets
• 2x Codex entries
• 2x Collectible toys
• 1x Weapon skin
• 1x Demonic Essence - Health
• 1x Demonic Essence - Armour
• 1x Demonic Essence - Ammo
• 392 Gold
• 3x Ruby
• 1x Wraithstone
• Cannon Crusher challenge: Destroy three artillery cannons (gold)
• Extreme Prejudice challenge: Disrupt all three of the cultist circles (Reverent Rocket Launcher weapon skin)
• Master Hunter challenge: Chase and destroy the hell fighter ship (gold)

The Doom Slayer sets his sights on the gates of hell, but before bringing justice to his enemies, he's got the most packed secrets list to work through first. This mission has every type of secret and collectible imaginable, even a bonus challenge that rewards an additional weapon skin.

Reckoning (Chapter 22)

• 11x Secrets
• 1x Codex entries
• 2x Collectible toys
• 1x Demonic Essence - Ammo
• 335 Gold
• 3x Ruby
• 1x Wraithstone
• Death Clock challenge: Kill two cosmic baron demons within five seconds of each other (Reverent Ravager weapon skin)
• Thy Flesh Consumed challenge: Kill 25 demons within ten seconds (gold)

Teaming up with the Sentinels to take down Ahzrak once and for all, Doom: The Dark Ages' final mission doesn't skimp out on secrets despite the spectacle. It's busywork, but at least you'll get the last two (and very cute) collectible toys out of it.