In-game pickup line
“Sing for your friends”
Mechanics
What Forgotten Lullaby does
- Tear-shooting familiars attack about twice as often while held.
- It improves a build with active familiar damage more than one relying only on Isaac's own tears.
Achievement #408
How to unlock it
Defeat The Siren, then blow up her skull.
Unlocking an item and finding it during a run are separate steps.
Explore more unlocksIn a run
Practical note
Pair it with several shooting familiars to benefit from the extra volleys.
Reference
Game data and sources
The trinket ID, icon, game-file tags, and short pickup line come from the extracted Repentance files. This effect explanation is an editorial summary checked against the references below. Repentance+ can differ.
