Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

Dull Razor is an unlockable activated item added in The Binding of Isaac: Afterbirth †.


  • Hurts Isaac without taking away health, activating any items that trigger upon taking damage.



For a full list of items that work with Dull Razor, see the list of damage triggered items. Note that any specific extra conditions the items may have for their activation still apply.

  • Removed in Repentance 15►Blanket Blanket / 15►Holy Mantle Holy Mantle / Wooden Cross Wooden Cross: Absorbs the "hit", wasting both items.
    • Added in Repentance Dull Razor ignores the shield, giving its normal effect without wasting the shield.
  • Added in Repentance15►Book of Virtues Book of Virtues: Spawns a grey wisp on the middle ring. The wisp doesn't fire any tears. Whenever Isaac takes damage, there is a chance that the damage is negated and one of the wisps is destroyed instead. "Damage" taken from using Dull Razor does not count for this effect.
  • Removed in Repentance 15►Car Battery Car Battery: Dull Razor activates twice, but "damage" is only dealt once, not triggering synergies a second time.
    • Added in Repentance Dull Razor activates twice, triggering synergies a second time.
  • 15►Cone Head Cone Head: Can block the "hit" Dull Razor inflicts, causing no effect.
  • 15►Crown of Light Crown of Light: Disables the effect for the current room.
  • Added in Repentance 15►Habit Habit: Doesn't charge Dull Razor itself.
    • Habit + 15►Schoolbag Schoolbag: The secondary item will be charged.
    • Added in Repentance Habit + 15►Car Battery Car Battery: The second activation causes Habit to charge Dull Razor.
  • 15►Isaac's Heart Isaac's Heart: Completely nullifies the effect of Dull Razor.
  • 15►Purity Purity: Cancels the current effect of Purity, allowing a different aura to be gained instead.

In-game Footage[]


  • The item works almost identically to the Voodoo Pin in Antibirth.


Bug Bug! 15►Habit Habit will charge Dull Razor if Isaac has 15►The Battery The Battery.
Bug Bug! Added in Repentance Dull Razor will kill Isaac in the Mirrored World, unless playing as The Lost The Lost.