" A devil from the Outer Dark,” he grunted. “Oh, they’re nothing uncommon. They lurk as thick as fleas outside the belt of light which surrounds this world. I’ve heard the wise men of Zamora talk of them. Some find their way to Earth, but when they do, they have to take on earthly form and flesh of some sort. A man like myself, with a sword, is a match for any amount of fangs and talons, infernal or terrestrial. Come, my men await me beyond the ridge of the valley. "

― Robert E. Howard , The Coming of Conan the Cimmerian (Conan the Cimmerian, #1)