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 while each of the first four party members in Dark Dawn (Matthew, Tyrell, Karis, and Rief) are the offspring of each of the four party members from the first Golden Sun, the later four party members (Amiti, Sveta, Eoleo, and Himi) are all the royalty of their respective nations?
...that the China Dress, renamed Sanan Dress in Dark Dawn, when used as a Usable item, emulates an attack-lowering enemy ability named Heartrender?
...that the Halt mechanic works on Djinn in The Lost Age the same way it works on people in both games - as in, when you use Halt on a Djinni and then interact with it, its face portrait will appear while it says "..." before returning to normal?
...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 the book in the menu screen of Dark Dawn says "Golden Sun" in glyphs?
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