The King in Green
Tieflings are humanoids of demonic appearance, generally found in the southern regions of Central Oerth, known as Austral. They once had a flourishing and very advanced civilization, hundreds or thousands of years ago, known as Bael Turath. Now, they have a cultural hatred for all things Dragonborn, and are generally cultural outcasts. One exception to this rule; Tieflings outnumber Elves and are second only in number to humans in the city of Escon.
Tieflings in Grun are only a small population; many of them are small merchants, living in their own little enclaves and generally not interacting with others. They are disliked, not for their monstrous appearance, but for their alliance with Escon, an traditional enemy of Grun.