You know the vicious mockery cantrip. Starting at 1st level, you can cast the charm person spell once per day. Once you reach 3rd level, you can cast the enthrall spell once per day. Once you reach 5th level, you can also cast the darkness spell once per day. Charisma is your spellcasting ability for these spells.

As an action, you kiss a creature charmed or grappled by you, or a willing creature. The target must make a Constitution saving throw (DC = 8 + your proficiency bonus + your Charisma modifier) against this magic. The target takes damage equal to 3d10 plus your level on a failed save, or half as much on a successful one. The target’s hit point maximum is reduced by the amount of damage taken. This reduction lasts for 24 hours and the target dies if this damage reduces it to 0 hit points.

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

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

Tieflings might not have an innate tendency toward evil, but many of them end up there. Evil or not, an independent nature inclines many tieflings toward a chaotic alignment.

Tieflings are about the same size and build as humans. Your size is Medium.

Your base walking speed is 30 feet.

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 color in darkness, only shades of gray.

You have resistance to fire damage.

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.

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