This might just be my favourite Robert E. Howard story of them all, and there's nary a monster or swinging sword in sight. Kull, of course, was Howard's more reflective, contemplative version of Conan, and most of the Kull tales were inspired by dreams that REH had had. This one is, in fact, all about dreams & reality, and the tonal pencil art of Mike Ploog suits the story entirely.
Marvel Team-Up #47
48 minutes ago