Conan the Adventurer

The Amulet of Vathelos (2x18)

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Conan travels to Stygia where he insults some demon-worshippers in a large city. He walks away from that encounter to eventually meet a man whose friend has been turned into stone by the same demon. This man knew Conan's grandfather when he was young, and we hear the entire story of how Conan's grandfather stole the amulet of Vathelos. In the end, Conan kills the demon.