Treasure Isle is an optional dungeon featured in Golden Sun: The Lost Age. It technically becomes accessible as soon as Felix's party becomes capable of sailing the Eastern Sea with the Lemurian Ship because the island containing its cave-like entrance is located near the northeast edge of the overworld. However, it is part of a set of four dungeons that can only be completed near the end of the game and feature similarly strong bestiaries, including a superboss that guards a summon tablet for one of the game's strongest collectable summon sequences; in its case, the especially tricky Star Magician must be defeated to earn the Mercury-aligned Azul summon. On the other hand, whereas the other dungeons normally require the Teleport Lapis found in the final storyline dungeon, Treasure Isle's lower floor fully opens up as soon as your party expands its roster following Jupiter Lighthouse and the Lift Psynergy becomes available, making it possible to complete this dungeon a little earlier in the game. Prior to that, the dungeon's earlier floor can be fully explored for comparatively weaker treasures and enemies as soon as you gain the Grind Psynergy in Lemuria at the end of the Eastern Sea segment of the game.
...that Alex being stated in the Japanese version of the first game to be the apprentice to Mia's late father, taken together with the third game revealing Alex and Mia to be cousins, means Alex was the apprentice of his uncle?
...that Elemental Power Psynergy like Flare Storm are twice as sensitive to Elemental Power and Resistance comparisons as Elemental Physical Attacks like Heat Wave?
...that after the Lemurian Ship has successfully flown with the Wings of Anemos for the first time in The Lost Age, going back to Hama in Contigo triggers an optional cutscene discussing more details about the urgency of the quest?
...that in The Lost Age holding down B causes you to auto-progress through cutscene dialogue at a moderate rate, which is a feature not present in the original Golden Sun?
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