The Mathura Herakles is thought to represent Herakles fighting a monster that had impervious what?
Nemean lion The Nemean lion ( ; Greek: Νεμέος λέων "Neméos léōn"; Latin: "Leo Nemeaeus" ) was a vicious monster in Greek mythology that lived at Nemea. It was eventually killed by Heracles. It could not be killed with mortals' weapons because its golden fur was impervious to attack. Its claws were sharper than mortals' swords and could cut through any armor.
Medusa In Greek mythology Medusa ( , ; Μέδουσα "guardian, protectress") was a monster, a Gorgon, generally described as a winged human female with living venomous snakes in place of hair. Gazers upon her hideous face would turn to stone. Most sources describe her as the daughter of Phorcys and Ceto, though the author Hyginus makes her the daughter of Gorgon and Ceto. According to Hesiod and Aeschylus, she lived and died on an island named Sarpedon, somewhere near Cisthene. The 2nd-century BCE novelist Dionysios Skytobrachion puts her somewhere in Libya, where Herodotus had said the Berbers originated her myth, as part of their religion.