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Shamshir-e Zomorrodneg?r (Persian: , 'the Emerald-Studded sword') is a sword in the Persian legend Shahnameh. The witch mother of a hideous horned demon called Fulad-zereh used a charm to make his body invulnerable to all weapons except this specific sword.
Shamshir-e Zomorrodneg?r was forged by K?ve for the Legendary Persian Prince Milad. After Milad's death in the 7th story of Shahnameh the sword was carefully guarded by Fulad-Zereh, not only because it was a valuable weapon, and indeed the only weapon that could harm the demon, but also because wearing it was a charm against magic. A wound inflicted by this sword could only be treated by a special potion made from a number of ingredients, including Fulad-Zereh's Brain.