Reliefs on a cup found in Mainz appear to depict a Mithraic initiation. On the cup, the initiate is depicted as being led into a location where a "Pater" would be seated in the guise of Mithras with a drawn bow. Accompanying the initiate is a mystagogue, who explains the symbolism and theology to the initiate. The Rite is thought to re-enact what has come to be called the ‘Water Miracle’, in which Mithras fires a bolt into a rock, and from the rock now spouts water.