Infernal Legacy

You know the thaumaturgy cantrip. Once you reach 3rd level, you can cast the hellish rebuke spell as a 2nd-level spell with this trait; you regain the ability to cast it when you finish a long rest. Once you reach 5th level, you can also cast the darkness spell once per day with this trait; you regain the ability to cast it when you finish a long rest. Charisma is your spellcasting ability for these spells.