Tieflings with a blood tie to Zariel are stronger than the typical tiefling and receive magical abilities that aid them in battle.
Ability Score Increase
Your Charisma score increases by 2, and your Strength score increases by 1.
Legacy of Avernus
You know the thaumaturgy cantrip. When you reach 3rd level, you can cast the searing smite 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 branding smite 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.