- Upon use, converts pickups within the current room to Blue Flies or Blue Spiders.
- Doubles Isaac's current amount of Blue Flies and Spiders.
- If Isaac has no Blue Flies or Spiders, spawns one Blue Fly or Spider.
- Book of Virtues: A wisp will only be summoned if Compost destroys at least one pickup, and the wisp's health will be equal to the number of pickups converted to Blue Flies/Spiders. If Isaac hits the blue fly cap of 64 as a result of using Compost, all but one of Isaac's wisps will despawn.
- Compost is organic matter that has been decomposed and recycled as fertilizer.
PC When using the item and obtaining an item (cards/pills/items) at the same time it will make the picked-up item disappear.
|The Binding of Isaac: Rebirth|
|Achievements||Attributes||Bosses||Cards and Runes||Challenges||Chapters|