How to Open the Trap Door for Eidolon Rod in Fisch

The Eidolon Rod is one of the most sought-after items in Fisch because it’s the only way to catch Phantom-mutated fish. But before you can buy it, you need to unlock a hidden trap door inside The Sanctum. Many players get stuck at this part since the game doesn’t explain the requirements clearly.

This guide breaks down everything you need to do, from level requirements to activating all Obelisks, so you can open the trap door without missing a step. Also check out our Fisch Codes for more rewards!

What You Need Before Opening the Trap Door

The trap door that leads to the Eidolon Rod will only open after you meet two main conditions:

1. Reach Level 350

You must be at least Level 350. If you’re below this, the trap door won’t react no matter how many Obelisks you activate.

2. Activate All 15 Obelisks

There are 15 Obelisks scattered across several areas:

• Cultist Lair
• Hall of Whispers
• Passage of Oaths
• The Sanctum

These Obelisks look like tall structures with stone knight statues. You need to activate every single one before the trap door becomes accessible.

All Obelisk Locations

Below is the complete list of coordinates so you can track them quickly:

Hall of Whispers

• 4404, -2234, -4703
• 4393, -2205, -4711
• 4393, -2234, -4652
• 4309, -2233, -4668
• 4219, -2233, -4691

Cultist Lair

• 4368, -2009, -4621
• 4237, -1977, -4726

Passage of Oaths

• 4266, -2483, -4722
• 4368, -2482, -4668

The Sanctum

• 4182, -2704, -4662
• 4360, -2710, -4732
• 4406, -2710, -4752
• 4446, -2687, -4670
• 4454, -2705, -4611
• 4367, -2710, -4600

After activating all of these, you’re ready for the final step.

How to Open the Trap Door

Once the last Obelisk is activated, return to The Sanctum.

• Walk to the back area of the building.
• Look around the ground floor for a small opening in the floor.
• The trap door will open automatically if all requirements are complete.

Inside, you’ll find the Eidolon Rod waiting for purchase.

What Happens Next

After opening the trap door, you can buy the Eidolon Rod for 2,000,000 Coins. This rod comes with powerful stats and allows you to catch Phantom fish, which are worth a lot due to their 4x value multiplier.

Opening the trap door for the Eidolon Rod can feel like a long checklist, but once you know where each Obelisk is located and meet the level requirement, the process becomes straightforward.

With the trap door unlocked, you’re only one purchase away from using the strongest mutation-focused rod in Fisch. If you’re aiming for high-value catches and steady income, this upgrade is more than worth the effort.