Dull Razor

Dull Razor is an activated item added in Afterbirth †.

Effect

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

Synergies

 * Habit: Using the Dull Razor will activate the Habit, restoring one charge.
 * Habit + 9 Volt or AAA Battery: The 9 Volt or AAA Battery will reduce the Dull Razor to only needing one charge, and using it will activate the Habit, effectively giving the Dull Razor infinite uses.
 * Habit + Car Battery: Fills two charges on use, allowing infinite uses of the Dull Razor.

Interactions

 * Items that occasionally block damage like Infamy, Cone Head, or Metal Plate can also block the effect of this item, wasting the charge.
 * Isaac's Heart will completely nullify the effect of this item.

In-game Footage
Dull Razor