By trophyraiders 
Chapter overview:
- Gold: 153
- Ruby: 1
- Demonic Essence – Armor: 1
- Secrets: 6
- Codex Entries: 1
- Collectible Toys: 1
- Challenges: 2
Mission Challenges
- Swallowed Whole: Complete the optional stomach encounter (100 Gold reward) — automatic by following this guide.
- Toe-To-Toe: Parry Cosmic Baron demons 10 times (Reverent Grenade Launcher skin reward). Parry during big enemy encounters (red markers).
Collectibles Walkthrough (Chronological Order)
Demonic Essence – Armor #1
- Automatic from miniboss at first red enemy encounter. Cannot be missed.
Secret #1 + 50 Gold (50/153)
- After killing all enemies and interacting with the organ, turn left to find a gold chest.
Secret #2 + 6 Gold (56/153)
- From the previous gold, turn around, then left. Don’t enter the main objective door yet. Follow the left wall and look up for a green skeleton grappling point. Throw your shield to jump up and collect the gold.
16 Gold (72/153)
- Continue main story. In the next room, look for a green statue above and destructible walls. Destroy the second wall from the right to find this gold.
5 Gold (77/153)
- Return to the middle of the room and destroy the first wall on the left to find this gold.
Secret #3 + Ruby #1
- Look up above after the last gold. Throw your shield at the blue symbol, then quickly at the green statue to jump up.
- Turn right, climb the left wall, then turn around to find the ruby in the secret area.
Secret #4 + 50 Gold (127/153)
- After destroying the second part of the organ, turn right. Throw your shield onto the green statue and jump to the platform with the gold.
Codex Entry #1 (Commander Thira)
- Follow quest markers back to the first organ room.
- Proceed through a large hallway filled with enemies; kill them. After the second wave, check the opposite side of the third organ part for the codex.
7 Gold (134/153) + Secret #5 + Challenge: Swallowed Whole + Collectible Toy #1 (Komodo)
- After collecting the codex, jump down the ledge, turn right, and throw your shield at the blue symbol to enter.
- Collect gold, drop down the hole, complete the fight to finish the challenge, and pick up the toy.
14 Gold (148/153) + Secret #6
- Leave through the portal, follow the wall to the right, and go through the first opening.
- Look up, throw your shield at the blue symbol to open a hallway. Collect gold at the end and climb the wall to find the secret area.
5 Gold (153/153)
- After destroying the third organ part, a path opens to the left. Find gold on a bridge behind this opening.
Completion Notes
Following this guide will give you 100% collectibles in the Belly of the Beast chapter, including the automatic completion of both mission challenges.
For all other chapters, check out the complete Doom: The Dark Ages Collectibles Guide.
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