Kull, the Conqueror #3

John Severin's cover for this 1972 Marvel issue says it all: a chained, bare-chested Kull swings a broad sword against an overwhelming tide of snarling demons and serpentine creatures, while the skull-faced sorcerer Thulsa Doom looms menacingly above the chaos in his sweeping red cloak. A crowned figure lies fallen at Kull's feet, making the stakes feel immediate and visceral. "The Demon-Hordes of Thulsa Doom!" promises exactly the kind of sword-and-sorcery spectacle that made Robert E. Howard's brooding king-warrior such a compelling figure in 1972 Marvel fantasy.