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All Keystone Locations (Luminescent Cavern in Fisch) – Unlock Now

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The Luminescent Cavern is the crown jewel of Fisch’s latest update, hidden deep within the Desolate Deep and glowing with mysterious energy.

Unlike normal zones, you can’t just swim in, you’ll need to collect and place the correct Keystones on the pedestals near the Mysterious Crack.

Each player gets a unique set of required stones, so knowing all possible locations is essential.

This guide covers every Keystone location with coordinates and provides a clear step-by-step walkthrough on how to access the Luminescent Cavern in Fisch.

How to Unlock Luminescent Cavern in Fisch

Step 1: Finding the Cavern Entrance

Before you start searching for Keystones, you need to locate the Mysterious Crack in the Desolate Deep.

  1. Head to Sunstone Island and swim to the Red Buoy.

  2. Dive straight down with your diving gear and flippers equipped.

  3. Turn right and follow the glowing coral trail until you reach a cavern wall.

  4. You’ll see three pedestals near the Diver NPC. Interact with them to see which three Keystones are required for you.

Now it’s time to gather them.

Step 2: All Keystone Locations in Fisch

There are eight possible Keystones scattered across the world. Below is a full breakdown with coordinates and details:

Keystone Location & Coordinates How to Find It
Cliff Keystone Castaway Cliffs (473, 230, -2159) Inside a small gap near the ledge leading to the second level of the island.
Mushroom Keystone Mushgrove Islands (2666, 130, -717) On top of a boat near the alligator abundance area.
Fossil Keystone Ancient Isles (6065, 225.5, 259.5) On a wooden heap lifted by cranes near the merchant.
Snowflake Keystone Snowburrow (2788, 153.5, 2603) Hidden inside a cave next to a pine tree. Unlock Snowburrow first by activating cracks in Snowcap Cave.
Volcano Keystone Roslit Volcano (-1970, 175.4, 268) Found in the middle stone inside the volcano.
Skull Keystone Forsaken Shores (-2797.5, 209, 1544.2) Beside the pirate NPC where you fix the map.
Lightning Keystone Grand Reef (-3406, 134.2, 262.2) On a small island to the left of the Shipwright’s island.
Turtle Keystone Terrapin Island (57, 149.5, 2032) Inside the Terrapin Hideaway cave.
Sun Keystone Sunstone Island (-935, 223, -984) Inside Merlin’s Hut on the island.

Step 3: Unlocking the Luminescent Cavern

Once you have the three required Keystones:

  1. Return to the Mysterious Crack at the Desolate Deep.

  2. Place each Keystone on its matching pedestal (press E to slot them in).

  3. If you try to insert the wrong one, you’ll get an error message pointing out which is needed.

  4. After all three are in place, the crack in the cavern wall opens up.

Swim through, and you’ll officially enter the Luminescent Cavern.

What’s Inside the Luminescent Cavern?

The Cavern isn’t just a visual treat with glowing walls—it’s home to:

  • Exclusive fish species for your bestiary

  • Event-related quests

  • Progression paths that unlock the next cavern

Before fishing, you’ll need to cross the Mysterious River inside, but once you do, you can start catching the rarest new species in the update.

SEE ALSO:

All Roblox Fisch Codes 

Quick Recap:

  • Step 1: Visit the Red Buoy at Sunstone Island → Dive to Desolate Deep → Check the pedestals at the Mysterious Crack.

  • Step 2: Collect the three required Keystones (possible from 8 total locations listed above).

  • Step 3: Slot them into the pedestals → Crack opens → Swim through to enter Luminescent Cavern.

The Luminescent Cavern is one of Fisch’s most rewarding areas yet, and with this guide, you’ll have no trouble piecing together the Keystones.