Binding of Isaac: Rebirth Wiki

(in Afterbirth † and Repentance)

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) 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) The invincibility frames allow Isaac to use Blood Donation MachineBlood Donation Machines and Devil BeggarDevil Beggars for free.
  • (in Repentance) Dull Razor ignores shields granted by Collectible Holy Mantle iconHoly Mantle, and similar items.

Synergies[ | ]

  • (in Repentance)Collectible Book of Virtues iconBook 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)Collectible Car Battery iconCar Battery: Dull Razor activates twice, triggering on-damage items twice.
  • Collectible Cambion Conception iconCambion 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) Collectible Blanket iconBlanket / Collectible Holy Mantle iconHoly Mantle / Wooden CrossWooden Cross: Absorbs the "hit", wasting both items.
  • (except in Repentance) Collectible Car Battery iconCar Battery: Dull Razor activates twice, but "damage" is only dealt once, not triggering synergies a second time.
  • Collectible Cone Head iconCone Head: Can block the "hit" Dull Razor inflicts, causing no effect.
  • Collectible Crown Of Light iconCrown Of Light: Disables the effect for the current room.
  • (in Repentance) Collectible Habit iconHabit: Doesn't charge Dull Razor itself.
    • Habit + Collectible Schoolbag iconSchoolbag: The secondary item will be charged.
      • Habit + Schoolbag + Collectible 9 Volt icon9 Volt: If Dull Razor is copied into the second active item through an effect such as Collectible Diplopia iconDiplopia or Collectible Crooked Penny iconCrooked Penny, the two Dull Razors can be switched between infinitely.
    • Habit + Collectible The Battery iconThe Battery + Collectible Car Battery iconCar Battery: Dull Razor will be charged, allowing for infinite uses of the item.
  • (except in Repentance) Collectible Isaac's Heart iconIsaac's Heart: Completely nullifies the effect of Dull Razor.
  • (in Repentance)PerfectionPerfection: Is not destroyed by a use of Dull Razor, as it counts as self-damage.
  • Collectible Purity iconPurity: 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 iconHabit will charge Dull Razor if Isaac has Collectible The Battery iconThe Battery.