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"A heavy key found in the house of a dead couple."
The Brass Key is a key item found in Misty Woods, and is required to fight Life Drinker, as it opens the path to a tile, as well as a White Crystal. It is found on the table in the first cabin in the farm, and unlocks the cellar in the cabin next to it. It leaves the inventory after use, and unlocking the cellar doesn't require selecting it from the key items; it will unlock when the girls interact with the cellar door.