 | Name | Key to the Castle's Secret Chamber |
| Type (Ingame) | Quest Item | |
| Rarity |  | |
| Description | An item that is key to the "Petrifying Gaze" scenario in Daiya's Three-Day Reverie, which can be used to open a secret chamber that conceals an ancient medicine. Its outer appearance is not much different from that of ordinary keys. |
wait, does she not have a constellation that gives a shield to other players when in co-op ;-;