Awaking Infernal Bloodline

The Infernal Blood that lives in you awakes and you gain the power of you bloodline.

You gain resistance of ever fire or cold damage.

you also learn the Bloodline spells. You know the thaumaturgy cantrip. When you reach 3rd level, you can cast the hellish rebuke 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 darkness 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.