Also, for the Meta:

Kuroten
One of the two scalpels wielded by Stein, this black blade is Cursed. Any wound inflicted by this blade will not heal until the blade has been destroyed, or Stein chooses to lift the curse. This includes magical healing, regeneration, and any other arcane capabilities that would cause the wound to heal. It IS possible to stop the bleeding, or to create artificial replacements for organs destroyed this way, as long as the damage to the tissue remains preserved.