The elusive Dusky Thread has finally been obtained by dedicated anglers. This exclusive material is the key to crafting the powerful Astraeus Serenade fishing rod. Players can only get it by completing a new secret quest from the NPC Merlin in the game Fisch. The quest went live following the recent Merlin Rework update.

According to player reports and verified game data, the thread cannot be bought or traded. This makes completing Merlin’s multi-stage challenge the sole method for acquisition. The quest, called Astraeus Serenade Part 1, sends players on a hunt for three uniquely mutated fish.
Merlin’s Quest Requires Rare Mutated Fish from the Mineshaft
To earn the Dusky Thread, players must present Merlin with three specific fish. All three are mutated versions of the Radiant Crystal fish. The required mutations are Celestial, Serene, and Breezed. Each one demands a different, specialized fishing rod to catch.
The fish are found in the newly added Mineshaft location. Access requires Merlin’s Veil. This area is located in the sea behind Merlin’s house on Sunstone Island. Once inside, the real challenge of catching the exact mutations begins.
Specialized Rods and Strategy Are Essential for Success
Catching the mutations is not random. Each needs a specific rod for a reliable chance. The Celestial mutation requires the Celestial Rod during a specific weather event. The Serene mutation needs the Polaris Serenade or Duskwire rods.
The Breezed mutation is caught with the Wind Elemental Rod. Using the Mutated Enchantment on these rods significantly boosts success rates. After collecting all three fish, players return to Merlin. He then rewards them with the coveted Dusky Thread crafting material.
This breakthrough allows top-tier fishermen to finally craft the end-game Astraeus Serenade rod. The Dusky Thread remains the most guarded secret in Fisch’s angling community.
Info at your fingertips
What is the Dusky Thread used for in Fisch?
The Dusky Thread is a mandatory crafting material. It is used exclusively to create the powerful Astraeus Serenade fishing rod. You cannot use it for any other purpose in the game.
Can I get the Dusky Thread without doing the quest?
No, the quest is mandatory. The Dusky Thread cannot be purchased, traded, or obtained from any other NPC or activity. Completing Merlin’s Astraeus Serenade Part 1 quest is the only way.
Where do I find the Radiant Crystal fish?
You find all Radiant Crystal fish inside the Mineshaft. This is a new area accessible with Merlin’s Veil. It is located in the water behind Merlin’s own house on the island.
Is the Astraeus Serenade rod worth the effort?
Yes, for dedicated players. It is considered a top-tier end-game fishing rod. Its stats and special abilities significantly outperform many other rods available in Fisch.
What happens after I get the Dusky Thread?
You use it as part of the recipe to craft the rod. You must gather the other required materials. Then, you can craft the Astraeus Serenade at the appropriate workstation.
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