- AreaNotre-Dame
- Sub-areaGreat Organ Room
- Nearest Mirror of LifeNotre-Dame Undercroft
The Great Organ Room sits in Notre-Dame; start from the Notre-Dame Undercroft Mirror of Life. Its map shows the Giant Organ, a breakable wall, 3 Secret Areas, the Melody Sheet for the Fugue of Notre-Dame, a DEF book, an XP statue and the weapon War and Famine.
Step on the organ's 14 floor keys to play it. From left to right they are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Sun, Moon, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces. The Fugue, picked up here, is Moon, Sun, Moon, Virgo, Leo. The Concerto from La Flèche is Gemini, Cancer, Virgo, Leo, Virgo, Leo, Gemini. The Sonata from the Sealed Scriptorium is Sagittarius, Capricorn, Pisces, Aquarius, Capricorn, Sagittarius, Capricorn.
The hidden melody is Moon, Libra, Scorpio, Aquarius, Capricorn, Virgo, Sun, Leo, Cancer, Aries. Playing it opens a gate, reveals a Secret Area in this room and fulfils a Soul Harvest Work of Mercy. Close by are Beelzebub's Seal in the Chapel of Patience, Joyeuse in the Path of the Penitent and the Infernal Medallion in the Reliquary.
Melody sheets
| Clue | Sub-area | Organ keys |
|---|---|---|
| Melody Sheet for the Concerto of Notre-Dame | La Flèche | 7 |
| Melody Sheet for the Fugue of Notre-Dame | Great Organ Room | 5 |
| Melody Sheet for the Sonata of Notre-Dame | Sealed Scriptorium | 7 |
In Great Organ Room
| Name | Kind | Spots |
|---|---|---|
 Breakable wall | Breakable wall | 1 |
 Melody Sheet for the Fugue of Notre-Dame | Clue | 1 |
 DEF book | DEF book | 1 |
 Giant Organ | Landmark | 1 |
 Secret Area | Secret Area | 3 |
 War and Famine | Weapon | 1 |
 XP statue | XP statue | 1 |
Near Great Organ Room
| Name | Kind | Sub-area | Spots |
|---|---|---|---|
 ATK book | ATK book | Tomb of the Chevaliers | 2 |
| The Masters of Music hide from Death | Clue | Collapsed Crypt | 1 |
 Beelzebub's Seal | Relic | Chapel of Patience | 1 |
 Infernal Medallion | Relic | Reliquary | 1 |
 Joyeuse | Weapon | Path of the Penitent | 1 |
 Wise Heart Fragment | Wise Heart Fragment | Chapel of Patience | 1 |