Dull Razor

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(except in Rebirth and Afterbirth)

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

Effect

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

Notes

  • (in Repentance and Repentance+) The item will cost 10 cents if found in a ShopShop
  • As using the Dull Razor will grant extra invincibility frames like normal damage, this item can be used to enter Curse RoomCurse Room for free, or, with proper timing, allow Isaac to avoid taking damage from an enemy or obstacle.
  • (except in Repentance and Repentance+) The invincibility frames allow Isaac to use Blood Donation Machine.pngBlood Donation Machines and Devil Beggar.pngDevil Beggars for free.
  • (in Repentance and Repentance+) Dull Razor ignores shields granted by Collectible Holy Mantle icon.pngHoly Mantle, and similar items.

Synergies

  • (in Repentance and Repentance+)Collectible Book of Virtues icon.pngBook 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.
  • (in Repentance and Repentance+)Collectible Car Battery icon.pngCar Battery: Dull Razor activates twice, triggering on-damage items twice.
  • Collectible Cambion Conception icon.pngCambion Conception: Dull Razor triggers a damage, allowing for free familiar spawn on repeated use.

Interactions

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.

  • (except in Repentance and Repentance+) Collectible Blanket icon.pngBlanket / Collectible Holy Mantle icon.pngHoly Mantle / Wooden CrossWooden Cross: Absorbs the "hit", wasting both items.
  • (except in Repentance and Repentance+) Collectible Car Battery icon.pngCar Battery: Dull Razor activates twice, but "damage" is only dealt once, not triggering synergies a second time.
  • Collectible Cone Head icon.pngCone Head / (in Repentance and Repentance+)Collectible Star of Bethlehem icon.pngStar of Bethlehem / Aura from White Poop.pngWhite Poops or White Dips: Can block the "hit" Dull Razor inflicts, causing no effect.
  • Collectible Crown Of Light icon.pngCrown Of Light: Disables the effect for the current room.
  • (in Repentance and Repentance+) Collectible Habit icon.pngHabit: Doesn't charge Dull Razor itself.
    • Habit + Collectible Schoolbag icon.pngSchoolbag: The secondary item will be charged.
      • Habit + Schoolbag + Collectible 9 Volt icon.png9 Volt: If Dull Razor is copied into the second active item through an effect such as Collectible Diplopia icon.pngDiplopia or Collectible Crooked Penny icon.pngCrooked Penny, the two Dull Razors can be switched between infinitely.
    • Habit + Collectible The Battery icon.pngThe Battery + Collectible Car Battery icon.pngCar Battery: Dull Razor will be charged, allowing for infinite uses of the item.
  • (except in Repentance and Repentance+) Collectible Isaac's Heart icon.pngIsaac's Heart: Completely nullifies the effect of Dull Razor.
  • (in Repentance and Repentance+)PerfectionPerfection: Is not destroyed by a use of Dull Razor, as it counts as self-damage.
  • Collectible Purity icon.pngPurity: Cancels the current effect of Purity, allowing a different aura to be gained instead.

In-game Footage

Trivia

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

Bugs

Bug Bug! Collectible Habit icon.pngHabit will charge Dull Razor if Isaac has Collectible The Battery icon.pngThe Battery.