Binding of Isaac: Rebirth Wiki

Added in Repentance

The Swarm is an unlockable passive item added in The Binding of Isaac: Repentance.


  • Gives eight orbital flies when picked up.
  • Each time a fly blocks a projectile, it will turn into a blue fly.
  • Each time a room is cleared, spawns an orbital fly.
    • The maximum number of orbital flies Isaac can have is 16.
  • This item belongs to the Beelzebub set. Collecting three items from this set will transform Isaac into a giant humanoid fly.

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