You have resistance to cold damage.

You know one Sorcerer Cantrip, CHA is the spellcasting ability.

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

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

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 35 feet.

You can hold your breath up to 15 minutes at a time.

Choose one of the following skills: Deception, Intimidation, Performance, or Persuasion. You have advantage on all ability checks made with this skill.

When you aren't wearing Armor, your AC is 13 + Dex modifier. You can use your natural armor to determine your AC if the armor you would naturally wear would leave you with lower AC. A shield's benefits apply as normal while you use your natural armor.

Your semi-prehensile tail is tipped with a bony blade. Immediately after a creature within 5 feet of you deals deals damage to you with a melee attack, you can use your reaction to make an unarmed strike against that creature with your tail. If you hit, you deal slashing damage equal to 1d4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.