Rear Door Key

The Rear Door Key is a key item in Xenoblade Chronicles. It can be found just west of Exile Fortress, when taking the path left of the main entrance. In the Definitive Edition, it is located further west. The key can be used to open the rear door of Exile Fortress from the narrow path right of the main entrance. This is useful when rescuing Kacha during the Kacha's Kidnapping without getting spotted by the Ignas and Reckless Godwin, but is not necessary.