Archfiends

The mightiest of all fiends, ruled only by The Nine Lords of Hell. Destined to cause chaos and they often tempt people with power to have warlocks, often to gather them souls.
(If there are no articles under here, that means your character has yet to discover them. But they do exist. If you want a connection to an Archfiend for your backstory, feel free to come to me with your ideas!)