Compost
ItemAfterbirth+Unlocked
activeGame ID 480★★★★
How do you unlock Compost?
Verified starting unlockSource data confirms that no unlock is required.
Doubles Isaac's Blue Flies and Blue Spiders, or spawns one if Isaac has none. Converts pickups in the current room into Blue Flies or Blue Spiders.
Available from the start
No unlock needed — this is available in every new save file.
What unlocking Compost leads to
Nothing depends on this yet.
Source: bindingofisaacrebirth.wiki.gg
Imported 2026-09-13