Tieflings

The most rare and generally the most distrusted of the races, tieflings are literal demons on earth. Tieflings are decedents from a long since disbanded cult of followers of Asmodeus that have since been cursed to follow in his likeness - an infusion between man and abysmal.

History
Before the calamity, Asmodeus bribed a devout cult who worshiped him with the promise of other-worldly powers in exchange for their help with his battle on the material plane. They agreed. Following their agreement, all members of the cult were transformed.

"[...] because a pact struck generations ago infused the essence of Asmodeus—overlord of the Nine Hells— into their bloodline. Their appearance and their nature are not their fault but the result of an ancient sin, for which they and their children and their children’s children will always be held accountable." (PHB)

In the millennia since this, tieflings have spread across the world. Depending on where they are from, some societies are more tolerant of them than others. There was a period of racism that lasted until the First Age of Lumither, as many blamed the tieflings for being traitors to the material. However, that prejudiced has for the most part died away.

Traits

 * Ability score increase: Your Charisma score increases by 2.
 * Size: Medium.
 * Height: Human sized, but can be slightly taller because of their horns (5' to 7').
 * Weight: Again, human sized (124–200 lbs).
 * Age: Mature at the same rate as humans, but some live slightly longer.
 * Speed: 30 feet.
 * Darkvision: You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.
 * Hellish Resistance: You have resistance to fire damage.
 * Infernal Legacy: You know the thaumaturgy cantrip. When you reach 3rd level, you can cast the hellish rebuke spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the darkness spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.
 * Languages: You can speak, read, and write Common and Infernal.