The Ancestral Forge is the ninth level in Doom: The Dark Ages, taking place mainly in a small mine. This level contains four collectibles, which consist of toys, codex entries, and weapon skins found in secret areas around each level. You can track those collectibles via the map screen, which displays the total number and any you have collected.

Check out our Doom: The Dark Ages Collectibles Guides Hub for links to guides for every level.