Fish Head
TrinketRebirthUnlocked
How do you unlock Fish Head?
Verified starting unlockSource data confirms that no unlock is required.
Spawns a Blue Fly every time Isaac takes damage.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Fish Head leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13