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Harbor of Souls, Doom: The Dark Ages’ 19th level, contains three collectibles. Collectibles take the form of codex entries, toys, and weapon skins, hidden though out most levels in the game. Doom: The Dark Ages has a built in tracker on the map screen, which lists the total number and checks them off as you collect them.
Check out our Doom: The Dark Ages Collectibles Guides Hub for links to guides for every level.
