The Swarm
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The Swarm is an unlockable passive item added in The Binding of Isaac: Repentance.
Effects
- 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.
In-game Footage
Bugs
 Bug!
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Each use of  Glowing Hourglass that does not move Isaac to a different room from the one he is currently in (such as by teleporting to the previous room then using it again) will duplicate orbital flies. Obtaining orbital flies by duplicating them can surpass the item's normal orbital limit.
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 Fly Items
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 Tainted ??? Unlocks
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 The Beast Unlocks
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 The Binding of Isaac: Rebirth
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