The Abyssborn Monstrosity is a secret-rarity fish that ranks among the hardest catches in Fisch. It's a reddish-purple creature with tentacles and eyes protruding from its body—small in size but enormous in challenge. Landing one of these will earn you 25,000 E$ and 5,000 base XP, plus bragging rights.

Location and Spawn Conditions

You'll find the Abyssborn Monstrosity only at Cursed Isle. It spawns exclusively during specific weather and time conditions:

  • Time: Night only
  • Weather: Rain
  • Season: Winter
  • Bait: Luminous Larva (exotic bait)

This combination is quite rare, so you may need to revisit Cursed Isle multiple times to align all conditions.

What Makes It So Hard

The Abyssborn Monstrosity applies a -97% progress speed debuff when you hook it. This means the reeling progress bar moves extremely slowly, making it the first fish in Fisch designed with this extreme penalty. Despite this punishing mechanic, it's surprisingly light for the difficulty it presents—the base weight is 5,750 kg, but actual catches range from 2,500 kg to 12,063 kg with an average around 4,000 kg.

💡 Tip — The moment you hook this fish, a "Secret" notification will flash above your head and a shimmering sound will play. This alerts you that you've landed something special.

Essential Enchantments

Because of the -97% progress penalty, the wiki strongly recommends equipping either the Steady or Blessed Song enchantment before attempting this catch. These enchantments will help counteract the severe reeling slowdown and make the catch actually feasible.

Without these enchantments, reeling becomes painfully slow and the catch window becomes dangerously narrow.

Step-by-Step Catching Method

  1. Equip either the Steady or Blessed Song enchantment on your rod.
  2. Travel to Cursed Isle.
  3. Stock Luminous Larva as your active bait.
  4. Wait for night-time and rainy weather during the winter season.
  5. Cast your bobber and hold to attract fish (you can shake your rod to speed this up).
  6. When you get a bite, hold down or click to begin pulling. Follow the blue line as closely as you can.
  7. Watch the progress bar at the bottom fill slowly. Because of the -97% debuff, this will take patience.
  8. Stay focused and keep the white bar aligned with the blue line. Missing even a few times will quickly drain your chances.
  9. Once the progress bar fills completely, you'll reel in your catch.
💡 Tip — This fish is incredibly difficult to land. Take breaks if you're getting frustrated—a fresh mind makes it easier to track the blue line during the slow reeling animation.

Rare Mutations

Like all fish in Fisch, the Abyssborn Monstrosity can spawn with mutations that change its appearance and rarity. Possible mutations include Lunar, Fossilized, Negative, Glossy, Nuclear, Primize, Giant, Bloom, Frozen, Shiny, Albino, Electric Shock, Sparkling, Mythical, Darkened, Ember, Silver, Hexed, Greedy, Heavenly, Stardust, Wisp, Mango, Chilled, Fortune, Cursed, and Tryhard variants. Some mutations can stack (like Big + Nuclear or Shiny + Lunar), creating even rarer combinations.

💡 Tip — Higher-rarity mutations are vanishingly rare on an already-hard catch. Don't chase mutations on this fish—just getting a regular Abyssborn Monstrosity is an accomplishment worth celebrating.