Region
Catacombs map
Named depths
Sub-areas in the sources are Catacomb Entrance, Path of the Abyss, Jaws of Limbo, Throat of Hell, Circle of Greed, Quarry Elevator, and Realm of Old Night. Mirrors of Life are listed at the Quarry Elevator and the Realm of Old Night. Death's story fight is at the Altar of Bones.
The eye path to Mammon is Ferryman's Wharf, Collapsed Path of Orpheus, Realm of Old Night, Antechamber of Sin, then Circle of Greed. Thrilling Eye is in the Paris Hospital, Trembling Eye is in the Pillaged Tombs, and Oozing Eye is on a high platform in the Circle of Greed.
Chests
Relics placed in this region include Mourning Bead, Specter's Whisper, Necro Charm, and Ebony Claw. A full chest-by-chest inventory is not in the sources. The Antechamber of Sin is a real room on that path. What is inside its chest is not confirmed, so this page does not name a reward for it.
What I ran into
Searchers want every chest. I can name the rooms and four relics. I cannot name every chest. The page is useful for the eye route and honest about the loot gap.
Questions
Where is the Antechamber of Sin?
On the path Ferryman's Wharf, Collapsed Path of Orpheus, Realm of Old Night, Antechamber of Sin, Circle of Greed.
Where is Oozing Eye?
A high platform in the Circle of Greed, at a red device inside a thorn circle. The prompt is R1 or E.