How to Get the Withered Mutation Fast in Fisch

The Withered mutation is a high-value alteration in Fisch that multiplies a fish’s sell price by 9.5x. Two pieces of gear can roll it, and the fastest route depends on which one you can obtain right now.

Quick answer: Equip the Withered Spear for a 25% chance per catch, or use the Decade Rod for a 10% chance. Buy the Withered Spear for 1,750,000 C$ at the Tidefall entrance after completing the Tidefall bestiary.

Withered mutation odds by gear

The Withered Spear delivers the highest odds, so it is the priority pick if you can meet its unlock condition. The Decade Rod is a lower-chance alternative when the spear is out of reach.

Gear	Withered chance	How to obtain
Withered Spear	25% per catch	Purchase for 1,750,000 C$ at Tidefall after completing the Tidefall bestiary
Decade Rod	10% per catch	Alternative option with lower odds

Unlock the Withered Spear in Tidefall

The Withered Spear does not drop from fishing or bosses. It only appears for sale once your Tidefall bestiary reaches 100% completion, which means every fish species tied to Tidefall must be caught at least once.

Open your Tidefall bestiary and note exactly which species are still missing. Sort them by whether they need a specific time of day, weather, or casting depth so you can target the right conditions instead of fishing at random.

Catch the missing entries under their required conditions. Tidefall species split into daytime and nighttime commons, weather-locked fish tied to rain, storms, or fog, depth-specific catches, and a few ultra-rare entries with low spawn rates.

Commit to the bait associated with a target species rather than swapping after every catch. Changing bait constantly lowers your odds and produces filler catches instead of new bestiary entries.

Confirm the bestiary shows full completion, then buy the Withered Spear for 1,750,000 C$ from the Tidefall vendor. Have the coins ready before you log the final entry, since the weapon stays visible but locked if you cannot afford it.

Tip: Server hopping to find an active rain or night cycle is often faster than waiting for one to arrive naturally, which saves whole weather cycles when you only need a single condition.

Withered Spear stats

Stat	Value
Power	15
Handling	−10
Piercing	3
Location	Tidefall
Price	1,750,000 C$

The negative handling means the spear swings slower than lighter weapons, but its Power and Piercing make it a capable pick alongside its 25% Withered roll.

Confirm the Withered mutation landed

When a catch rolls the mutation, the fish shows the Withered name and its altered appearance, and its sell value is multiplied by 9.5x over the base price. Only one mutation applies to a fish at a time, so a Withered roll replaces any lower-multiplier mutation that would otherwise appear.

Neither method is guaranteed on a single cast. The Withered Spear still misses 75% of the time and the Decade Rod misses 90% of the time, so expect several catches before the mutation appears. Keep fishing under the same setup, and the rolls will accumulate in your favor.