The Forgotten Cave is a location in Xenoblade Chronicles. It is located in Tephra Cave. It is not reachable until the events at the Mechonis Core. It is reached by falling down the hole just north of the Heavenly Window. It is a small area; falling down only leads to the dead end location Hidden Warehouse, with the Reckless Galdon, or the recently opened up path to the Spring of Grief, or Tephra Cavern. There is an earth Ether Crystal deposit here.