- 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.
- Blanket / Holy Mantle / Wooden Cross: Absorbs the "hit", wasting both items.
- 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.
- Habit: Doesn't charge Dull Razor itself.
- 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.
- The item works almost identically to the Voodoo Pin in Antibirth.
|Bug!||Habit will charge Dull Razor if Isaac has The Battery.|
|Bug!||Dull Razor will kill Isaac in the Mirrored World, unless playing as The Lost.|
|The Binding of Isaac: Rebirth|
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