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Isaac Rebirth
Beelzebub App

Beelzebub, also known as Lord of the Flies, is a transformation that occurs in The Binding of Isaac: Rebirth.


  • Turns Isaac into a giant humanoid fly.
  • Most enemy flies will automatically become blue flies.


At least three of these items must be collected for Isaac to transform.


  • The name of the transformation is named after the demon who is known as the "lord of the flies" or "chief of the devils".
  • Beelzebub is a demonic fly and one of the seven princes of Hell.
  • Beelzebub is also a name for the devil.

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