The Tomb of the Forgotten Paladin

In ages past, the kingdoms of man warred with one another, as men are wont to do. The reasons were as varied as the men who died, with each believing they were justified in the slaughter of the other. One of the kingdoms sought to end the wars by summoning a powerful demon to fight for them. In their foolishness, they pitied the fiend, allowing it to escape their bindings. Breaking free, it murdered its summoners and walked free upon the earth. It left nothing but misery and pain in its wake.