Islet Cave

From Golden Sun Universe
By completing the trading quest, Islet cave can be accessed, with a bit of help from a grateful turtle.

The Islet Cave (小島のどうくつ, Island's Cave) is an optional dungeon in Golden Sun: The Lost Age, which can first be accessible from the Sea of Time Islet in the middle of the game via a trading sidequest. It is notable for its second, deeper portion, accessible only with the Teleport Psynergy at the end of the game, because it is the site of a Mercury Djinni, the best level-grinding spot in the game, and the optional boss Sentinel guarding the summon tablet Catastrophe.

Access and Walkthrough

Access to the Islet Cave is gained by trading objects with animals, which can be found on little islands all over Weyard. To communicate with them, the only means is to use the Mind Read Psynergy. Here is the list of trades :

  • Go to the E Tundaria Islet (located, unsurprisingly, east of the continent of Tundaria continent) and "talk" with Pengus the penguin. Solve the little puzzle in order to save his fiance and he will reward you with the Pretty Stone.
  • Give the Pretty Stone to the bird on the SE Angara Islet (located northwest of Lemuria, east of Champa). It will give you the Red Cloth.
  • Give the Red Cloth to the cow on the N Osenia Islet (located southwest of Lemuria, north of Alhafra). The Sand Psynergy is necessary to reach it, so you won't be able to complete this mini-quest before completing Gaia Rock. The cow will give you some of its Milk.
  • Give the Milk to the dog on West Indra Islet (located in the stretch of ocean between Gondowan and Indra). It will give you the Li'l Turtle.
  • Finally, go to the Sea of Time Islet, southeast of Lemuria, and give the smaller turtle to the larger turtle, Lonesome George. It will thank you by taking you to its secret spot, the Islet Cave.

The Islet Cave, when you will first be able to enter it, has a small cave-like system that is only accessible at this point. It has to offer the Venus Djinni Meld, as well as a pair of Turtle Boots, which is of limited use, and a Rusty staff that would be reforged into the Dracomace in Yallam (which can be strong depending on how early you can get to Islet Cave). For now, you will not be able to access the second portion of Islet Cave, so return to the turtle to sail back to the main land of the Sea of Time Islet.

The boss residing within the depths of Islet cave, Sentinel guards the Catastrophe Summon tablet.

Once you gain the Teleport Psynergy in the Mars Lighthouse near the end of the game, return to Islet Cave, because you will be able to use it on the circular pattern at the cavernous portion of Islet Cave to teleport to the second half of Islet Cave. It consists of a series of four linear hallways that have a high encounter rate with the most powerful random monsters outside the random monsters in the Anemos Inner Sanctum. Within this area, you will find the following points of interest:

  • In the second hallway, use the Tremor Psynergy on the shaking statue on one of the pillars to the left to drive out the Mercury Djinni Serac to battle and earn.
  • Among the random enemies are Cruel Dragons, which drop Tisiphone Edges, among the most powerful weapons in the game. They drop the sword with the highest rarity rate, however, with a 1/256 chance to get it normally, and even though felling each Cruel Dragon you come across with the attack effect of an offensive Mars Djinni will dramatically increase the drop chance, it will still be a 1/64 chance, so the Cruel Dragon is one of the most popular targets of Random Number Generator abuse.
  • It is also the place where you will encounter Wonder Birds, the random monsters that yield the greatest amount of experience points of any random monster in the game by an enormous margin: more than 8000 EXP per bird, and this can easily become more than 11000 EXP per bird if each one is felled with the attack effect of an offensive Mercury Djinni. In addition, if you encounter two, they can revive each other, maximizing your experience gain. Because of that, the Islet Cave is the only place to go in The Lost Age for post-game level grinding.
  • The optional boss Sentinel awaits the party in the last room, and puts up a strong fight both with its offenses and its immunity to any form of Psynergy. Once defeated, you will gain the Catastrophe Summon tablet, which is the strongest summon sequence outside the two summons in the potentially miss-able Anemos Inner Sanctum dungeon.


Bestiary of Islet Cave (Pre-Teleport)
Monster Name LVL HP ATK DEF AGI EXP Coins Weakness Drop Drop Rate
Dinox 27 172 264 82 116 239 166 Star jupiter.gif Nut.gif Nut 1/16
Harridan 27 231 261 66 118 150 164 Star jupiter.gif Nut.gif Nut 1/32
Magicore 28 321 253 74 109 169 208 Star mercury.gif Aura Gloves.gif Aura Gloves 1/128
Squirrelfang 27 130 229 59 168 176 131 Star jupiter.gif Elixir.gif Elixir 1/32
Stone Soldier 28 179 241 105 104 98 98 Star mercury.gif Elixir.gif Elixir 1/32
Venus Djinni (Meld) (unique) 27 710 221 65 187 729 531 Star jupiter.gif N/A

Enemy Formations (Pre-Teleport Area)

  • Group 1: Harridan x1
  • Group 2: Magicore x1
  • Group 3: Magicore, Stone Soldier x1
  • Group 4: Squirrelfang x1
  • Group 5: Squirrelfang, Harridan x1
  • Group 6: Squirrelfang, Magicore x1
  • Group 7: Dinox x1, Squirrelfang x1
  • Group 8: Dinox x1-2
Bestiary of Islet Cave (Post-Teleport)
Monster Name LVL HP ATK DEF AGI EXP Coins Weakness Drop Drop Rate
Chimera Worm 38 251 452 133 152 359 179 Star mars.gif Water of Life.gif Water of Life 1/32
Cruel Dragon 38 636 539 216 162 661 358 Star mars.gif Tisiphone Edge.gif Tisiphone Edge 1/256
Druj 38 672 549 197 205 627 348 Star mars.gif Berserker Band.gif Berserker Band 1/128
Wonder Bird 38 424 510 190 285 8622 333 Star mercury.gif Dark Matter.gif Dark Matter 1/128
Mercury Djinni (Serac) (unique) 34 920 290 90 257 1093 706 Star mars.gif N/A
Sentinel (boss) 48 8736 608 216 171 10538 6144 Star venus.gif N/A

Enemy Formations (Post-Teleport Area)

  • Group 1: Chimera Worm x1-2
  • Group 2: Chimera Worm x1-2, Druj x1
  • Group 3: Wonder Bird x1, Chimera Worm x1
  • Group 4: Wonder Bird x1-2
  • Group 5: Druj x1, Cruel Dragon x1
  • Group 6: Cruel Dragon x1, Wonder Bird x1
  • Group 7: Cruel Dragon x1-2


In the "earlier" portion of Islet Cave, these three collectibles are found:

Rusty Staff.gif Rusty Staff: In the chest at the upper left of the "main water hall" with the teleport pads, accessed by riding a rolling log from right to left. Take it to the blacksmith in Yallam and he will reforge it into the Dracomace staff artifact.
Turtle Boots.gif Turtle Boots: In the chest to your left as soon as you enter the "main water hall" with the teleport pads. This is mainly meant for collection and selling for money, since it is far outclassed by a far superior (but still iffy) item called Safety Boots found much earlier in the game.

Venus djinn.gif

Meld: A Venus Djinni reached by rolling a log across the water in the vertical "water-hallway" to the right. It must be fought to be acquired.

Whereas the long series of linear halls beyond the Teleport pads holds these treasures:

SummonIconCatastrophe.gif Catastrophe: This Summon tablet lies at the final room of the dungeon, guarded by the optional boss Sentinel. Essentially, the dungeon's "main" goal and reward, following one of the main optional "superboss" battles of the game.

Mercury djinn.gif Serac: This Mercury Djinni is hiding in the shaking statue up on one of the pillars in one of the screens. To make it fall and make the Djinni able to be battled to be collected, cast Tremor near the statue. Precise positioning, and thus several repeated attempts to Tremor the statue off, may be required.

Dungeons in Golden Sun
Sol SanctumGoma CaveKolima Forest / Tret TreeBilibin CaveMercury LighthouseFuchin Falls CaveMogall ForestAltin PeakLamakan DesertVale CaveVault CaveAltmiller CaveGondowan CaveColosso FinalsLunpa FortressSuhalla DesertSuhalla GateBabi Lighthouse / Tunnel Ruins / Venus LighthouseCrossbone Isle
Dungeons in Golden Sun: The Lost Age
Kandorean TempleDehkan PlateauYampi DesertAlhafran CaveAir's RockMadra CatacombsGondowan CliffsKibombo MountainsGabomba StatueGabomba CatacombsLemurian ShipShrine of the Sea GodTaopo SwampAqua RockGaia RockIzumo RuinsAnkohl RuinsTundaria TowerShaman Village CaveTrial RoadJupiter LighthouseMagma RockMars LighthouseTreasure IsleYampi Desert CaveIslet CaveAnemos Inner Sanctum
Dungeons in Golden Sun: Dark Dawn
Goma Plateau / Tanglewood / Abandoned MinePsynergy Training GroundsGoma Highlands RoadKonpa Ruins / Konpa CavePassaj Mountain ClimbBarai TempleThe OuroborosHarapa RuinsCraggy Peak RuinsTeppe RuinsPort Rago CanalPhantasmal BogKolima ForestTalon PeakBelinsk RuinsWarrior's HillYamata RuinsBurning Island CaveLonely Island RuinsGaia Falls IsletSnowdrift ShrineApollo Ascent / Apollo SanctumLost ShipOtka IslandCrossbone Isle