Bloodline of Asmodeus

The tieflings connected to Nessus command the power of fire and darkness, guided by a keener than normal intellect, as befits those linked to Asmodeus himself.

ability score increase: Your Charisma score increases by 2, and your Intelligence score increases by 1.

age: Tieflings mature at the same rate as humans but live a few years longer.

Size: Medium

speed: Your base walking speed is 30 feet.

Languages: You can speak, read, and write Common and Infernal.

parent race: Tiefling

race features:
Size. Your size can be Small instead of Medium. Darkvision. Thanks to your infernal heritage, you have superior vision in dark and dim conditions. 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 colour in darkness, only shades of grey. Hellish Resistance. You have resistance to fire damage. Infernal Legacy. You know the Thaumaturgy cantrip. Once you reach 3rd level, you can cast the Hellish Rebuke spell once as a 2nd-level spell. Once you reach 5th level, you can also cast the Darkness spell once. You must finish a long rest to cast these spells again with this trait. Charisma is your spellcasting ability for these spells.