The Floodgate Key is a key item in Castlevania: Harmony of Dissonance. It is found at the end of the Skeleton Cave (Castle A) and is required to drain all of the water at the lower levels of the Luminous Cavern in order for Juste to proceed further and fight Death.
In order to use the key, Juste will have to go to the very end of the caves, about two rooms left from where the Merchant's shop is. The room will have a fountain and a mechanism with a cross on it and a keyhole at the bottom. After it has been used, a message will read: "Immense water drained away somewhere", hinting that the lower caverns have become accessible.
|Item Data: Floodgate Key|
|Image||Name - Game|
|Type / Users||Attributes / Consume||Statistics / Sell||Found||Notes|
|Enter the lion's cross in the cavern.|| Key|
| Find: Entrance (Castle b)|