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The Swarm item
The Swarm is an unlockable passive item in The Binding of Isaac, added in the Repentance DLC.
Description
On pickupSpawns 8 orbital flies.
While heldEach time one of the flies blocks a projectile, it will turn into a Blue Fly.
An additional orbital fly is spawned upon clearing a room, up to a maximum of 16 at a time.
Note
This page shows the latest information as of the new Repentance+ (Online Co-op) DLC.
To see information about this item for the previous Repentance version, check this page instead.
How to unlock?
Defeat The Beast as Tainted ???.
Transformations
Item pools
The Swarm can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
| Key Master |
1.0/1.0
|
| Greed Treasure Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| summonable | Can be summoned via  Lemegeton. |
| fly | Contributes towards the Beelzebub transformation. |
Special synergies
The following special synergies and interactions for The Swarm have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Abyss | Spawns 3 cyan locust that are linked to each other, being 25% smaller, and have a chance to destroy enemy projectiles upon contact. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the external Isaac Wiki.
Belly Jelly 
Sacred Orb 
Sanguine Bond 
Heartbreak 
Bloody Gust 
Salvation