The Ringwraiths, also known as the Nazgûl, are fictional characters from J.R.R. Tolkien's Middle-earth legendarium. They were once mortal men who were given powerful rings of power by Sauron, the Dark Lord. Over time, the rings corrupted them, turning them into wraiths, or ghost-like beings, bound to serve Sauron. The Ringwraiths are known for their terrifying presence and are often depicted wearing dark cloaks and armor. They are relentless in their pursuit of the One Ring, which was forged by Sauron to control the other rings of power. Their primary goal is to find and reclaim the One Ring to restore Sauron's dominion over Middle-earth.