Tiefling; Chthonic Legacy

Darkvision

You have Darkvision with a range of 60 feet.

Fiendish Legacy (Chthonic)

You are the recipient of a legacy that grants you supernatural abilities. You have Resistance to Necrotic damage. You also know the Chill Touch cantrip.

When you reach character level 3, you learn the False Life spell. When you reach character level 5, you also learn the Ray Of Enfeeblement spell. You always have these spells prepared, and you can cast each spell once without a spell slot. Once you cast either of these spells with this trait, you can't cast that spell with it again until you finish a Long Rest. You can also cast the spell using any spell slots you have of the appropriate level.

Intelligence, Wisdom, or Charisma is your spellcasting ability for the spells you cast with this trait (choose the ability when you select the legacy).

Otherworldly Presence

You know the Thaumaturgy cantrip. When you cast it with this trait, the spell uses the same spellcasting ability you use for your Fiendish Legacy Trait.