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 Strength score increases by 1.
Legacy of Avernus. You know the Thaumaturgy cantrip. Once you reach 3rd level, you can cast the Searing Smite spell once as a 2nd-level spell. Once you reach 5th level, you can also cast the Branding Smite spell once as a 3rd-level spell. You must finish a long rest to cast these spells again with this trait. Charisma is your spellcasting ability for these spells.