Forgotten Lullaby
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How do you unlock Forgotten Lullaby?
In The Binding of Isaac, Forgotten Lullaby is unlocked by unlocking Forgotten Lullaby (Achievement).
Structured pathSource-backed requirements are mapped into trackable steps.
Improves the fire rate of Isaac's familiars.
How to unlock: Blow up The Siren's skull after defeating her
What unlocking Forgotten Lullaby leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13