Dull Razor

Effect

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

Notes

• As using the Dull Razor will grant invincibility frames like normal damage, this item can be used to enter (Curse Room) Curse Rooms for free, or, with proper timing, allow Isaac to avoid taking damage from an enemy or obstacle.
• (Removed in Repentance) The invincibility frames allow Isaac to use (Blood Donation Machine.png) Blood Donation Machines and (Devil Beggar.png) Devil Beggars for free.
• (Added in Repentance) Dull Razor ignores shields granted by Holy Mantle, and similar items.

Synergies

• (Added in Repentance) 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.
• (Added in Repentance) Car Battery Dull Razor activates twice, triggering on-damage items twice.

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.

• (Removed in Repentance) Blanket / Holy Mantle / (Wooden Cross) Wooden Cross: Absorbs the "hit", wasting both items.
• (Removed in Repentance) Car Battery: Dull Razor activates twice, but "damage" is only dealt once, not triggering synergies a second time.
• Cone Head: Can block the "hit" Dull Razor inflicts, causing no effect.
• Crown of Light: Disables the effect for the current room.
• (Added in Repentance) Habit: Doesn't charge Dull Razor itself.
  • Habit + Schoolbag: The secondary item will be charged.
  • Habit + Car Battery: The second activation causes Habit to charge Dull Razor.
• Isaac's Heart: Completely nullifies the effect of Dull Razor.
• Purity: Cancels the current effect of Purity, allowing a different aura to be gained instead.