Guppy's Tail - The Binding of Isaac

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Guppy's Tail is a passive item in The Binding of Isaac.

Grants a 33% chance of replacing room clear rewards with a Chest or a Locked Chest.

Grants a 22% chance to replace the room clear reward with nothing.

Due to these effects, keys become more scarce as they can often times be replaced with Locked Chests.

This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.

This item contributes towards the Guppy transformation. Collecting 3 items from this set will grant Isaac flight and spawn a Blue Fly 66% of the time when a tear hits an enemy.

Guppy's Tail can be found in the following item pools:

Name	Weight
Devil Room	1.0/1.0
Red Chest	1.0/1.0
Curse Room	1.0/1.0
Greed Curse Room	1.0/1.0
Greed Devil Room	1.0/1.0

The following tags are applied to this item:

Id	Description
summonable	Can be summoned via Lemegeton.
dead	Contributes towards unlocking The Parasite.
guppy	Contributes towards the Guppy transformation.
offensive	Can appear for Tainted Lost.

Below is the Internal Item Description as shown in-game.
Note that some stat changes are not displayed here. Please see the main description for the full effects.

Guppy's Tail

• Increases chance of chests as room-clear rewards, but also increases chance of no reward at all
• Abyss: x1 locust 1x Isaac's damage