If you’ve spent hours hacking through demon hordes in the gritty, medieval-themed Doom total conversion, you already know how easy it is to miss half the hidden content tucked into every shadowy corner. All secrets Doom the Dark Ages hides aren’t just trivial Easter eggs, either: many unlock permanent power-ups, exclusive weapon skins, and even cut story beats that add far more depth to the campaign. I’ve put 40+ hours into full playthroughs on both normal and ultra-violence difficulty, so I’m breaking down every hidden detail you won’t find in basic tutorial guides, no cheap exploits or cheat codes required.
Hidden Collectibles That Unlock Exclusive In-Game Rewards
Most players rush through maps to get to the next big demon fight, but stopping to hunt for hidden collectibles will make your endgame experience far smoother, especially on higher difficulty levels where ammo and health are constantly scarce. The two most valuable collectible sets are runestones and medieval tapestries, each tied to permanent, game-changing rewards you can’t get any other way. Collecting all 24 hidden tapestries unlocks the developer commentary mode, which includes behind-the-scenes stories about how the mod team blended classic Doom lore with real medieval historical references to build the game’s grim, immersive world.
There are dozens of collectibles scattered across 12 campaign maps, but these three are the most commonly missed by first-time players:
- The flooded catacombs runestone in Map 1: Break the cracked stone wall behind the pile of charred knight skeletons, right after you pick up the first shotgun.
- The hidden tapestry in Map 7: Climb the crumbling watchtower after defeating the first Hell Knight wave, then jump to the hanging wooden platform to reach the secret alcove.
- The unholy amulet in Map 12: Use the rusted key you pick up from the dead peasant NPC to open the locked cellar in the burning village, before you trigger the boss fight.
You don’t have to 100% every map on your first playthrough, but keeping an eye out for small clues like unusual torch placements, cracked stone walls, and distant glowing lights will help you catch most of these collectibles without a dedicated guide. Even finding half the runestones on your first run will give you enough bonus damage to make the final boss fight feel far less frustrating.
All Secrets Doom the Dark Ages Hides Behind Optional Boss Fights
Optional boss fights are some of the best-kept secrets in the mod, and most players never even find out they exist. Beating these bosses unlocks some of the most powerful perks and weapons in the entire game, but they’re significantly tougher than regular story bosses, so you’ll want to come prepared. The first optional boss, the Lich King, spawns in Map 4’s abandoned church basement when you light all four unlit torches in the room. Beat him, and you’ll get the Eternal Fire perk, which adds burn damage to all your shotgun shells for the rest of the playthrough. The second optional boss, the Fallen Paladin, spawns in Map 9’s forgotten graveyard when you leave an offering of 50 health pickups on the stone altar. He drops the Holy Shield, which blocks 70% of all incoming projectile damage, a literal lifesaver for the final campaign boss.
Optional bosses are 2x as tough as regular story bosses, so don’t try to trigger them unless you have at least 200 armor and a fully upgraded rocket launcher, or you’ll get one-shot before you can even land your first hit. If you’re someone who likes to take short, low-stakes breaks between tough boss attempts to reset your focus, you’re not alone. Lots of players I know step away for 5 minutes to stretch, grab a snack, or play a quick casual game to get their frustration out before they try again. Casual players who need a quick distraction between tough boss runs often boot up Yono Slots, a short-round casual game that fits neatly into 5-minute gaps without pulling you too far out of the game’s tense atmosphere. Once you’re refreshed, you’ll have a far easier time dodging the Lich King’s area-of-effect attacks and landing your critical hits to take him down fast.
Cut Story Beats You Can Only Unlock With Secret Choices
What makes this mod stand out from most other Doom total conversions is its surprisingly deep story, and there are multiple cut story beats you can only unlock if you make specific, unprompted choices during your playthrough. Most players kill every moving thing they see on their first run, but if you spare the possessed peasant in Map 3 instead of shooting him, he’ll give you a key to a hidden armory in Map 6 full of rare ammo and weapon upgrades, and he’ll even come back to help you fight off a demon wave in Map 10 as a thank you. Another hidden choice comes in Map 8, where you’ll find a glowing hellish obelisk in a hidden cave. If you destroy it instead of activating it, you’ll skip a brutal 3-wave demon ambush, but you’ll miss the full cutscene that explains how this medieval version of Earth was invaded by Hell in the first place.
Your choices don’t change the final ending of the campaign, but they add a ton of extra lore context that makes the whole story feel far more immersive and personal. I missed all of these hidden story beats on my first playthrough, because I was too focused on mowing down demons to stop and read the small dialogue prompts that pop up when you interact with friendly NPCs. If you care about the game’s story, take an extra 10 seconds to read those prompts before you pull the trigger, or you’ll miss out on some really thoughtful, well-written lore details.
Multiplayer-Exclusive Secrets for Co-op Playthroughs
If you prefer playing through the campaign with friends, you’ll be happy to know there are a handful of co-op exclusive secrets that don’t exist in single-player mode. The most popular one is the secret arena in Map 5: if all four players stand on the four stone pedestals in the central courtyard at the same time, you’ll trigger a 5-wave demon ambush, and beating it will unlock four exclusive upgraded weapons, one for each player, that can’t be found anywhere else in the game. Another co-op secret is the team damage buff in Map 11: if one player brings the golden goblet you find in Map 2 to the hidden co-op altar in the north side of the map, every player on the team gets a permanent 20% damage buff for the rest of the campaign.
Co-op secrets only trigger if all players are at the same location and have completed the required objectives first, so make sure your team is communicating if you want to unlock these rewards. They make the final co-op boss fight far easier, especially if you’re playing on the ultra-violence co-op difficulty where enemies have three times more health than they do in single-player. Even if you don’t care about 100% completion, these co-op secrets are a fun way to mix up the campaign with friends, and they add a lot of replay value for players who have already beaten the single-player mode.
At the end of the day, half the fun of playing a custom Doom mod like this is hunting down every hidden detail the dev team tucked into every corner. All secrets Doom the Dark Ages holds aren’t just there for completion bragging rights, either: they make every playthrough feel unique, even if you’ve already beaten the campaign half a dozen times. Take your time, explore every off-path nook, and don’t be afraid to experiment with weird interactions, because you never know when you’ll stumble on a new secret no one else has found yet. Even after 40 hours of play, I’m still finding new tiny Easter eggs every time I boot up the game, and that’s what makes this mod so special for long-time Doom fans.
