Did Thulsa Doom lie to Conan, or did he tell him the truth?
UPDATE 9 February 2018: Zen Conan
The riddle of steel is like the sound of one hand clapping. Thulsa Doom learns it by direct experience. It’s the only thing Thulsa Doom will believe: it takes an Atlantean blade from an old king’s horde in the side of his neck to tell him.
Conan faces his own challenge. Having killed Thulsa Doom, does he take his place? No. He remains Coana. I don’t say he’s right, just that he’s Conan.