|Space to use|
|Unlocked By||Complete Sheol with Samson|
An antiquated straight razor stained with blood.
Exact Heart Price
Before The Womb:
- Consumes hearts in the same way as Razor Blade
From The Womb onward:
- Costs half a red heart if Isaac has one red heart and any soul heart
- Costs half a soul heart if Isaac has half a red heart and at least one soul heart
- Costs one heart otherwise
- Items that grant temporary invincibility which exempts Isaac from sacrificing hearts, e.g. The Chariot / Celtic Cross / The Polaroid
- Bloody Lust/Samson's Lock - Enemy projectiles will also be destroyed on use, which will count as "kills" towards extra damage.
- Blood Rights resembles a straight razor, which could be considered a symbol of reaching manhood.
- Blood Rights could be a reference to the musical "Sweeney Todd: The Demon Barber of Fleet Street," where the main character, a barber with the alias Sweeney Todd, murders his customers by slitting their throats with a straight razor.
- Using the Blood Rights on a Mask + Heart will only kill the 'masks', leaving the hearts alive, but one hit away from death. This is not due to the item itself so much as the damage value exactly bringing a Heart to 0HP.
- Blood Rights can hit off-screen enemies like with The Necronomicon.