Douse Drop

The Douse Drop is a Utility Psynergy item featured in  and, by extension, Golden Sun: The Lost Age. It bestows the Douse Psynergy, which causes a small rainfall that is useful in various situations.

The Douse Drop is automatically dropped upon defeating the Killer Ape boss in Mogall Forest. It exists more for the sake of convenience than as an item critical to progress because the party can access Douse regardless by adopting certain mixed Classes that involve having Mercury Djinn set. The Douse Drop ensures that the party has access to Douse even if none of the individual Adepts can currently use it naturally.

The Douse Drop is part of Isaac's inventory in The Lost Age regardless of whether Password data transfer is used on the file before the Reunion, and its existence is even more incidental because Piers innately knows Douse even if he is not in his default Mariner class series.