Morgause's cave is located near or in the Darkling woods in the kingdom of Camelot. The cave was guarded by the Blood Guards, and might be the place where they hid themselves, thus surviving the Great Purge. In this cave, Morgause prepared a potion in a big cauldron in which she threw a handkerchief, which had Uther's tears on it and a Mandrake root, that sank in the potion. The spell caused Uther to hallucinate, seeing people who had died because of his choices and actions before and during the Great Purge.