The Savage Sword of Conan #174

Direct

Young Conan, the thief, is given a mission that has been the death of many a man before him. Lady Siddhara asks him to steal the healing and rejuvenating red stones from the immortal Ramtha Karn. Conan is accompanied by her bodyguard Palus, who also used to be Siddhara's lover. Trapped in Karns citadel, Conan discovers that the stones feed on human blood. He kills Ramtha Karn by destroying one of the stones.