Binding of Isaac: Rebirth Wiki

Added in Repentance

Chewed Pen is a trinket added in The Binding of Isaac: Repentance.


  • Adds a 10% chance to fire tears that slow enemies.
    • This chance is affected by Luck. The activation rate is equal to 1/(10 - (Luck / 2)). At base luck (0), the chance is 10%, maxing out at 100% at 18 luck.
    • Due to how this formula works, increases in activation rate are only seen with every 2 points of luck, as this formula rounds down after dividing Isaac's luck by 2.


  • This trinket is extremely similar to the Game Squid trinket found in the eternal edition of the original The Binding of Isaac, which was never added to Rebirth.
  • This trinket made its first debut in the Community Remix mod for Flash Isaac, previously being called The Pen.