Fish Tail is a trinket added in The Binding of Isaac: Afterbirth †.
Effects[ | ]
- Many items and trinkets that generate Blue Flies or Locusts will generate twice as many.
Notes[ | ]
- Flies may spawn on top of each other, appearing as a single fly initially.
Synergies[ | ]
Blue Fly / Locust sources that are doubled:
Other notable interactions:
Compost: Isaac will gain twice as many flies per use, meaning each fly will be tripled.- Beelzebub: Blue flies generated will be doubled, but charmed flies will not be doubled.
- Rotten Baby: Will spit two flies at a time with one being a copy. Will only spawn more flies when the original fly is destroyed.
- Parasitoid: The duplicated flies will spawn on top of the enemy and deal damage immediately.
- Tainted ??? / IBS: Blue flies created by corny poops will be duplicated when spawned in, but not when the poop is broken.
- Keeper / Tainted Keeper: Blue Flies created from hearts will be doubled.
Interactions[ | ]
- Golden Trinket / Mom's Box: No effect.
- 7 Seals: No effect.
- Guppy: No effect.
- Cricket Leg: No effect.
- Soul of Apollyon: No effect.
In-game Footage[ | ]
 Fly Items
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| Items |
 The Binding of Isaac: Rebirth
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