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 when you cast the Halt Psynergy on any townsperson, they'll say only the first word of their sentence when you talk to them and then return to normal?
...that while the Revive Psynergy is available to a Venus Adept through the default Squire class series only from Gallant onward, it is available to a Venus Adept in any stage of the Swordsman class series?
...that a small underground body of water in the tunnel underneath Mikasalla can be removed with Parch?
...that all of the townspeople of Prox have Mind Read-able thoughts after the final boss in The Lost Age that cannot be seen without hacking because your party only has Isaac and Felix, and does not have access to the Mind Read Psynergy?
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