Tiefling

Tieflings control the remnants of the Divine Empire.  After the disappearance of the Devas, the Divine Empire lost it's guidance, and collapsed in many places.  The tiefling Stewardship still attempts to run the empire has it always had been run, but without the wisdom and knowledge of the Devas, their pockets of control are stagant at best.  Many pockets of the Stewardship (which is spread among many continents) have been pressured into joining the Worldly Empire.  Tieflings used to be the nobles and lords of the Divine Empire, and as such they see the Dragonborn of the Worldly Empire as rivals at best, and ursurpers in the more common view.

Tieflings are stereotyped as the power of a by-gone era, clinging to authority that is slowly failing in legitimacy.  They are seen as old-fashioned, legitimate, traditionalists, knowledgeable, well-heeled, and slowly crumbling.  However, the age of the Divine Empire was a golden age in the known world, and people still look up to them for that.

Known slightly less are those non-noble tieflings, who are adaptable and driven - while many tieflings cling to power, those tieflings who are making a place in the world are becoming more well-known.  In the meritocracy of the Worldy Empire, tieflings are a rising force, much to the private dismay of the dragonborn.

For tiefling PCs:
Tieflings are as written in the PHB.