Forgotten Lullaby
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Forgotten Lullaby is an unlockable trinket added in The Binding of Isaac: Repentance.
Effects
- Doubles the rate of fire of Isaac's familiars.
- Familiars with charged shots will have their charge time halved. The recovery time between shots is not affected.
Notes
- Does not affect wisps.
Interactions
Golden Trinket / 
Mom's Box : No effect.
Incubus / 
Twisted Pair: As the familiars depend on Isaac's fire rate, Incubus and Twisted Pair work normally up to moderately high fire rates around 10. Beyond that, however, Forgotten Lullaby starts to lose effect: at 27.5 fire rate e.g. achievable with 
Soy Milk there no longer is any improvement and going even higher the trinket becomes detrimental, halving the familiars' damage output at the absolute maximum of 120 fire rate.-
Tainted Lilith: No effect on her special 
Gello. 
Hushy: No effect on Hushy.
In-game footage
Trivia
- This trinket was originally called Song of the Siren in Antibirth.
- "Forgotten Lullaby" is the title of the secret room theme in Mudeth's original soundtrack for the Antibirth mod.
 Familiar Modifiers
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 The Binding of Isaac: Rebirth
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