"I feel numb..."
Item ID 5.100.486
Recharge Time 2 rooms
Collection Grid (page 5, column 1, row 1) (page 5, column 2, row 1)
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.
Blanket / Holy Mantle / Wooden Cross : Absorbs the "hit", wasting both items.
Dull Razor ignores the shield, giving its normal effect without wasting the shield.
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 Crown of Light for the current room.
Habit : Doesn't charge Dull Razor itself.
Habit + Schoolbag : The secondary item will be charged.
Isaac's Heart : Completely nullifies the effect of Dull Razor.
Purity : Will cancel the current effect of Purity, akin to taking regular damage.
The Lost : "Damage" taken from Dull Razor does not kill The Lost, allowing him to make full use of Dull Razor.
The item works almost identically to the Voodoo Pin in Antibirth.