Mercury Lighthouse

Mercury Lighthouse is the first of the Elemental Lighthouses to be visited. It is found in Golden Sun, and it is here where the party first meets Mia. After Isaac uses Psynergy to move a statue that blocks the entrance, Mia nods her thanks and enters the lighthouse, where she is stopped by a Lizard Man. The party defeats this monster, and Mia moves on. It is only after moving another statue that blocks her way that Mia joins with the party. She brings with her a Mercury Djinn and the Ply Psynergy which, besides healing, is used in the lighthouse as a utility Psynergy.

At the top of Mercury Lighthouse, the party encounters Saturos and Menardi's party, and there is a battle between Isaac's group and Saturos. The antagonists succeed in lighting the beacon, and they depart for Venus Lighthouse with their hostages Jenna and Kraden in tow. The lighting of Mercury Lighthouse does have a beneficial effect, however. The Water of Hermes begins to flow from a fountain outside the lighthouse. This water has a potent healing effect, and this frees Mia to join the party for their quest, as well as providing the cure for Tret's curse.