In the popular Roblox game “Fisch,”players encounter a formidable boss enemy known as Cthulu, who serves as the gateway to the Second Sea. Defeating this powerful foe is essential for advancing to this new region, which is packed with exciting challenges. Uniquely, Cthulu does not roam freely in the ocean; instead, you can find it within a designated boss chamber, accessible only to seasoned players.
Confronting Cthulu is no small feat, and engaging in this battle is unavoidable if you wish to progress. The encounters can be treacherous, so preparation is key.
Locating Cthulu in Fisch

To initiate your quest against Cthulu, head to Terrapin Island. Follow the steps outlined below to find the hidden boss chamber:
- Navigate to Terrapin Island by following the location marker displayed on your screen.
- Locate the Sea Traveler NPC situated on the island’s western side. For GPS users, the coordinates are XYZ: 140, 150, 2030.
- Proceed to the wall behind the Sea Traveler NPC to access the Crypt of the Green One.
- In this crypt, you will encounter a locked iron gate, beyond which stands an NPC. Engage with this NPC to unlock the gate.
- Keep in mind that entry through the passage behind the iron gate requires a minimum character level of 200. Players below this level will meet a swift end.
- Once past the gate, you’ll enter the boss room where Cthulu will await your challenge.
Strategies for Defeating Cthulu in Fisch
Similar to battling the Scylla boss, a special weapon is necessary to effectively vanquish Cthulu. You must obtain the Keeper’s Torch, which allows you to unleash flames that diminish Cthulu’s health. Although the initial damage from the flames is modest, there are tactics to amplify your output.

Cthulu’s health bar is color-coded with Purple, Blue, Green, Yellow, Orange, and Red lines at the bottom. Within the boss chamber, you’ll discover corresponding lanterns. By imbuing your Keeper’s Torch with these lanterns, you can fire flames of the matching color; for instance, charging the Keeper’s Torch with a red lantern allows it to shoot red flames.
As long as Cthulu’s health is above the red threshold, using red flames will inflict significant damage. However, once its health decreases to a lower color tier, you must switch to the corresponding lantern to maintain high damage levels.
Upon conquering Cthulu, a brief cutscene will unveil your character diving into an underground passage that leads directly to the Second Sea, specifically to Waveborne Island, the starting point in this exciting new area. Defeating Cthulu not only grants you access but also lets you speak with the Sea Traveler NPC on Terrapin for quick teleportation to the Second Sea.
Frequently Asked Questions
Where can I locate the Sea Traveler in Fisch?
The Sea Traveler NPC can be found on the western shore of Terrapin Island.
What level is required to challenge the Cthulu boss in Fisch?
To take on Cthulu, players must be at least level 200 or higher.
How can I defeat Cthulu in Fisch?
The key to defeating Cthulu lies in utilizing the Keeper’s Torch, which you can find in the boss chamber.