The Kitchen Door Key is a Key Item in Xenoblade Chronicles. It can be found in the hallway south of the Arena in Prison Island. The Bone Pillar must be raised to be able to pick up this item. Afterwards it can be used to unlock the door in the southern half of the wall between the Banquet Hall and the Kitchen, enabling the party to revisit the Kitchen, the Bone Pillar controls, and the Behemoth Nest.