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.
Hafgufa Hafgufa (Icelandic, "haf" "sea" + "gufa" "steam") is the name of a massive sea monster reported in the "Örvar-Odds" saga to have existed in the Greenland Sea which was said to disguise itself as an island or pair of rocks rising from the sea.