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 Hsu's name changed to his Japanese name Ulmuch in The Lost Age because string compression algorithms in The Lost Age literally prevents certain letter and case combinations like "Hs" from being programmed?
...that the Darksword, being the weapon with the highest attack rating increase in both The Lost Age and Dark Dawn (210), is the best weapon for any adept using only the Quick Strike Psynergy to be holding?
...that when fighting the Mercury Djinni Serac in Islet Cave, it is statistically slightly weaker than the Mercury Djinni Balm, which you are guaranteed to pass by first in Mars Lighthouse in the game?
...that sailing into Gondowan and docking on the patch of land immediately north of Kibombo lets you fight the stronger monsters from the continents in the Great Western Sea?
...that in Dark Dawn, while any party member or any enemy is highlighted as the target(s) for a battle command, moving the stylus across the screen manually rotates the camera?
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