Islet Cave is an optional dungeon featured in Golden Sun: The Lost Age. It becomes accessible during the arc of the game in which Felix's party sails the Eastern Sea searching for pieces of the Trident needed to pass into the Sea of Time. Islet Cave is hidden in Sea of Time Islet, located southeast of the Sea of Time, but it can only be accessed after the party has earned the Sand Psynergy from completing Gaia Rock; this is because Sand is needed to reach one of the NPCs that take part in a chain of rare item trades spanning various islets. The last item in this sequence is the Li'l Turtle, which is given to the turtle living at Sea of Time Islet so that it will voluntarily ferry Felix to Islet Cave and back. Unlocking the earlier portion of this short dungeon allows the player to collect the Venus DjinniMeld, but a deeper portion of it can only be reached by using the Teleport Psynergy — found near the end of the game — on a "Teleport pad" that brings the party to a long, underground path. Another Djinni, the Mercury DjinniSerac, can be collected along the way to the end of the path, and the optional boss Sentinel guards the Catastrophesummon tablet at the end of the hallway. The underground hallway is also the best spot for endgame level-grinding because the party can randomly fight Wonder Birds that award over 8,000 experience when felled.
...that most non-final bosses in the first game, including Toadonpa, Storm Lizard, and Tempest Lizard, are susceptible to status conditions such as instant death, Death Curse, and Deadly Poison?
...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 the Curse Psynergy forwards its own countdown timer when used multiple times on the same enemy target, and that Curse works twice as fast against enemies that act twice per turn?
...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 the book in the menu screen of Dark Dawn says "Golden Sun" in glyphs?
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Note that this site contains SPOILERS. While templates are in place in various articles to indicate to readers that there is storyline material that players yet to complete the games may not yet know and may not yet want to know, if you haven't finished the currently-released games, then you read at your own risk.
11/24/2018: Datamining for Super Smash Bros. Ultimate confirms a total of eight Golden Sun-related Spirits, an Isaac-themed costume for the Mii Swordfighter, and both music tracks returning from previous Smash games.
