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 repeatedly battling the Tua Warriors at the end of Dark Dawn gives both enormous amounts of experience and guaranteed Water of Life drops, mostly obsoleting other methods of revival if you collect enough?
...that Khiren Waters and Ginsengs in Dark Dawn, the only consumable items so far in the series that restore PP by set amounts, can be bought in unlimited quantities in Harapa and Tonfon respectively?
...that Menardi's Death Size and Karst's Death Scythe are the exact same ability in the GBA games' code but named differently between games?
...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 The Lost Age holding down the Select button while highlighting an equippable item in a shop brings up a menu that lets you check its Item Details?
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