Infernal blood

prerequisite: to not be a tiefling

You have inherited infernal heritage spellcasting ability of your ancestors. This ability allows you to cast thaumaturgy at will, . You can also cast each of the following spells once with this ability: darkness, hellish rebuke, and disguise self. You regain the ability to cast these spells when you finish a long rest.

charisma is your spellcasting ability for these spells, and you cast them at their lowest possible levels.