"Curse of the Nefarious Backlash!" is a blue text modifier on weapons in Borderlands 2
Found on the following blue text weapon: Doc's Orphan Maker, (or any other version of the Orphan Makers Shotguns such as Captain Blades or Sidewinder) which you get for completing the "Message In A Bottle" mission in the Borderlands 2 DLC: Captain Scarlett and her Pirate's Booty
Grants Weapon Effects[edit]
CURSE: When firing the weapon you take damage from the recoil