This page is a room-by-room breakdown of Dian Cécht Cathedral. All "recurring features" of a given room — namely, enemies that respawn whenever the room is reentered and blue chests that self-refill whenever the zone is exited and reentered — are listed in bold above one-time collectibles and events. All chest icons shown in the map screen below are the zone's blue chests.
- Screen 1:
- ×2 Killer Barber, ×2 Buer, ×1 Gieremund, ×3 Poltergeist, ×1 Cyhyraeth
- ×1 Gieremund, ×1 Demon (Hard)
- Exit to Entrance
- Bookcase about Critical Swing technique
- Shortcut shard on stand
- Breakable wall containing MP Max Up
- Screen 2:
- Screen 3:
- Screen 4:
- ×1 Killer Barber, ×1 Buer, ×1 Simian, ×1 Lance Armor, ×2 Cyhyraeth
- ×∞ Dullahammer Head (Hard)
- Blue chest containing Mithridate, Obsidian, Elm, and/or Iron (requires Reflector Ray/Double Jump)
- Trail of purple lanterns allowing sequence break using Double Jump kicks
- Reflector Ray trail leading to upper reaches
- HP Max Up in lower bell
- Capacity upgrade in upper reaches (requires Reflector Ray/Double Jump)
- Capacity upgrade at lower-right corner (requires Reflector Ray)
- Green chest containing Macuahuitl (requires Reflector Ray)
- Within the separated, topmost area accessed only from Oriental Sorcery Lab:
- Exit to Oriental Sorcery Lab
- Bookcase about Back Steal technique
- MP Max Up in upper bell
- Brown chest containing Potion
- Green chest containing Hair Apparent II
- Screen 5:
- ×1 Nyabon
- Screen 6:
- ×1 Demon, ×1 Ordog
- Green chest containing Dance Mask
- Bookcase, The journal of an unnamed alchemist Vol. 2
- Breakable wall containing Rose Ring
- Capacity upgrade
- Screen 7:
- Todd the Killer Barber's cosmetic service
- Screen 8:
- ×2 Killer Barber, ×1 Gargoyle, ×1 Demon
- ×1 Gieremund (Hard)
- Screen 9:
- ×4 Gargoyle, ×1 Bloodbringer, ×1 Demon
- Green chest containing Hair Apparent I
- Bookcase about Rapid Fire technique
- Green chest containing Hair Apparent X (requires entering screen from Screen 18)
- Lever in top area opening it up back to the rest of Screen 9 below
- Screen 10:
- ×1 Poltergeist
- Exit to Entrance
- Screen 11:
- Screen 12:
- Craftwork (Boss)
- Screen 13:
- HP Max Up
- Green chest containing Unicorn Ring
- Screen 14:
- Green chest containing Crusader's Armor
- Familiar: Silver Knight shard on stand
- Screen 15:
- ×1 Lance Armor, ×1 Leraje
- ×1 Lance Armor (Hard)
- Breakable ceiling leading to MP Max Up
- HP Max Up
- Familiar: Silver Knight shard on stand
- Screen 16:
- ×1 Ocypete, ×1 Light Elemental, ×2 Lance Armor, ×∞ Dullahammer Head
- 2 blue chests containing Mithril, Platinum, Sponge Cake, and/or Wool
- HP Max Up
- Brown chest containing Scrambled Eggs (requires Double Jump-kicking off Lance Armor or Dullahammer Head)
- Red chest containing 2000G (requires Double Jump-kicking off Lance Armor or Dullahammer Head)
- Screen 17:
- ×1 Gamigin
- Screen 18:
- ×3 Leraje, ×1 Light Elemental, ×1 Ocypete, ×∞ Malediction
- Green chest containing Very Fine Equipment/R (requires Double Jump-kicking off left lantern to land on bell)
- Red chest containing 2000G (requires Double Jump-kicking off left lantern to land on bell)
- Breakable wall containing HP Max Up
- Entrance to screen 19 opened up by making the lower-left bell drop
- Breakable floor to screen 9 manifests only by making the lower-right bell drop
- HP Max Up in upper bell (requires Invert or High Jump)
- Screen 19:
- ×1 Cyhyraeth
- ×2 Lance Armor (Hard)
- Locked door requiring opening from the right side with lever
- Green chest containing Cake/R
- Screen 20:
- ×2 Lance Armor, ×1 Simian, ×1 Gamigin, ×1 Shield Outsider, ×1 Gargoyle
- ×∞ Dullahammer Head (Hard)
- Blue chest containing Mithril, Platinum, Sponge Cake, and/or Wool
- Screen 21:
- ×1 Leraje, ×1 Ocypete, ×1 Archdemon
- Exit to Hall of Termination
- Locked door to Hall of Termination opened by a lever accessed from the Cathedral side that requires Invert or High Jump
- HP Max Up (in Hall of Termination side)
- Red chest containing 2000G (in Hall of Termination side) (requires Double Jump-kicking off Archdemon)
- Bookcase about Lunging Serpent technique
- Red chest containing 2000G (requires Invert or High Jump)
- MP Max Up in lower bell (requires Invert or High Jump)
- Familiar: Silver Knight shard on stand (requires Invert or High Jump)
- Green chest containing Carpenter's Key (requires Invert or High Jump)
- Screen 22:
- Screen 23:
- Bloodless (boss), dropping Blood Steal shard
- Screen 24:
- Exit to Livre Ex Machina
- Green chest containing Red Umbrella