I'm trying to come up with a canonical lore-friendly backstory for a Devil Tongue Tiefling to have a cursed sword. Current excuse is a family heirloom, but being that Hexblades are explicitly tied to the Shadowfell it doesn't work as well for a character of Fiendish descent to have one. Maybe his ancestor is Orcus? What sort of alternatives have you seen in play or thought might be fun?