FISCH Guide How to Unlock the Mossjaw Room in the Lost Jungle

The Lost Jungle update in FISCH introduced one of the most mysterious areas yet — the Mossjaw Room. This hidden chamber is home to some of the rarest and most valuable fish in the game, including Mossjaw and Elder Mossjaw. However, reaching it isn’t simple; players must first solve a series of rune puzzles scattered throughout the Forgotten Temple. This guide will walk you through everything you need to know about unlocking the Mossjaw Room and what to expect once inside. Also check out our Fisch Codes for more rewards!

What is the Mossjaw Room in FISCH?

The Mossjaw Room is a secret fishing area hidden deep within the Lost Jungle’s Forgotten Temple. It can only be accessed after completing five rune challenges located in different rooms of the temple. Once unlocked, this chamber becomes one of the best farming spots in the entire game thanks to its exclusive fish species and rare loot.

Players can use this room to catch high-value fish that sell for massive profits, especially when paired with enchanted rods and special baits.

How to Unlock the Mossjaw Room

Unlocking the Mossjaw Room involves completing five rune rooms hidden inside the Forgotten Temple. Each rune puzzle is unique and tests different mechanics — from parkour challenges to memory-based puzzles. Here’s a breakdown of the full unlocking process:

1. Find the Forgotten Temple

First, head to the Lost Jungle area on your map. You’ll find the entrance to the Forgotten Temple near the large vine-covered cliffs. The entrance is hard to miss, marked by glowing symbols and stone archways.

2. Complete All 5 Rune Rooms

Inside the temple, you’ll encounter five rune chambers, each marked with numbers (1–5). Completing each one rewards you with a rune.

• Rune Room 1 – Pattern Puzzle: Step on the floor tiles in the correct order to activate the rune.
• Rune Room 2 – Rising Water Obby: Jump through platforms quickly before the water fills the room.
• Rune Room 3 – Spike Maze: Follow the safe path through the spikes to reach the rune.
• Rune Room 4 – Moon Phase Puzzle: Interact with moon symbols in the correct phase order.
• Rune Room 5 – Invisible Path: Walk carefully across the hidden bridge or use a glider to reach the end.

Each successful completion lights up one rune symbol on your screen. Full Guide on How to complete the Rune Rooms!

3. Return to the Main Hall

After collecting all five runes, head back to the main hall of the temple. You’ll notice a large sealed stone door surrounded by five pedestals, each corresponding to a rune you’ve collected.

4. Place All Five Runes

Interact with the pedestals and insert the runes in their correct spots. The order doesn’t matter — once all are placed, the pedestals will glow brightly, and the large stone gate will open.

5. Enter the Mossjaw Room

After the gate opens, step inside to enter the Mossjaw Room. You’ll find a glowing pool where the rare Mossjaw and Elder Mossjaw can be caught. Make sure to bring Gloworm Bait or Blessed Bait for better odds of landing rare catches.

What You Can Find Inside

The Mossjaw Room isn’t just for fishing — it’s a treasure zone filled with high-value loot opportunities. Here’s what makes it worth the effort:

• Exclusive Fish: Mossjaw and Elder Mossjaw (extremely high sell value)
• Chance of Special Treasures: Certain enchanted baits may yield rare relics
• Hidden Lore Elements: Some players have found glowing runes hinting at future updates

Tips Before Entering the Mossjaw Room

• Equip your best fishing rod — Wind Elemental or Seraphic Rods perform well here.
• Bring Gloworm or Shiny Totem to increase rare catch chances.
• Keep an oxygen tank or Glimmerfin Suit Level 2 for safe underwater exploration.
• The room is only accessible after all rune progress is saved, so don’t leave the temple early.

Unlocking the Mossjaw Room in FISCH is a challenging but rewarding journey. Between solving rune puzzles, exploring the Lost Jungle, and finally fishing in the secret chamber, it’s one of the best endgame experiences in the game. Once you’ve opened the Mossjaw Room, make the most of it — fish patiently, use your best gear, and you’ll walk away with some of the rarest catches in FISCH.