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Spawns a familiar that flies around the room in a zig-zag pattern and explodes on contact with an enemy. Respawns after ten seconds.


"Big Beautiful Fly"


  • Spawns a familiar that flies around the room like a Boom Fly and explodes on contact with an enemy, dealing 60 damage to all enemies within its blast radius and 10 damage to the enemy it touched.
    • It will respawn 10 seconds after exploding, or upon entering a different room.
  • This item belongs to the Beelzebub set. Collecting three items from this set will transform Isaac into a giant humanoid fly.


  • BFFS!
    - Doubles the contact damage to 20 and increases explosion damage by 25.
  • Hive Mind
    - Increases the size of BBF. Whether or not this impacts explosion damage dealt is unknown.

Found in

  • Baby Shop
  • Key Master
  • Treasure Room


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