The Cave-Door Key is an item left behind by Briggs in his room in Champa. It is a small golden key found in Champa's cave lodgings, on the right side of the third floor of the tunnel leading up to Obaba. It is used to unlock a door in a cave across the water underneath Champa. In the room is a total of 102 coins. There is also a pillar burning. Move the pillar into the hole then have Eoleo cast the psynergy Thermal. This will lead to the real treasure chest containing Orihalcon.
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