A piece of hell's gate fell to the earth. Black as Satan's soul. Found by something other than human but not wholly a beast. Dipped in molten rock and hammered into a desired shape. Sharper than Obsidian and colder than the icy heart of the deep sea. Formed to cut and whither with fear those who oppose any who wield it. The dark blade is the master and  not the implement, as it drains the life out of whoever holds it. Stealing souls to do the devils work.