You have Resistance to Necrotic damage and Radiant damage.

You have Darkvision with a range of 60 feet.

As a Magic action, you touch a creature and roll a number of d4s equal to your Proficiency Bonus. The creature regains a number of Hit Points equal to the total rolled. Once you use this trait, you can’t use it again until you finish a Long Rest.

You know the Light cantrip. Charisma is your spellcasting ability for it.

When you reach character level 3, you can transform as a Bonus Action using one of the options below (choose the option each time you transform). The transformation lasts for 1 minute or until you end it (no action required). You can transform like this 3 times per Long Rest. This Upgrades to 4 times at level 7, 5 times at level 11 and 6 Times at level 16.

Once on each of your turns before the transformation ends, you can deal extra damage to one target when you deal damage to it with an attack or a spell. The extra damage equals your Proficiency Bonus, and the extra damage’s type is either Necrotic for Necrotic Shroud or Radiant for Inner Radiance.

Here are the transformation options:

Inner Radiance. Searing light temporarily radiates from your eyes and mouth. For the duration, you shed Bright Light in a 10-foot radius and Dim Light for an additional 10 feet, and at the end of each of your turns, each enemy creature within 10 feet of you takes Radiant damage equal to your Proficiency Bonus. Youre Healing Also increases by 1d4 for the duration.

Necrotic Shroud. Your eyes briefly become pools of darkness, and flightless wings sprout from your back temporarily. Creatures other than your allies within 10 feet of you must succeed on a Charisma saving throw (DC 8 plus your Charisma modifier and Proficiency Bonus) or have the Frightened condition until the end of your next turn.

You know the Thaumaturgy Cantrip

You have Advantage on Saving Throws aggainst becoming Frightened.

You are considered a Celestial for anything you need to be considered one for.

You can choose to Sacrifice youreself and release all the Divine Energy from youreself outward.

WARNING. This will KILL youre Character AND you will NOT be able to be brought back. NOT even by a Wish Spell. Only Divine Intervention of a God of Life, Rebirth, God of Death or Ao can bring you back. 

Every Enemy in a 30 Feet Radius must suceed on a Constitution Saving Throw aggainst youre Spellsave DC or take 20d10 Radiant Damage and be blinded for 1 Round. Bypassing Resistance to Radiant Damage unless the Target is a not Evil Celestial. Half Damage on a Success. 

Fey, Fiend, Undead and Abberations have Disadvantage on this Saving Throw. 

As a being infused with some Power of the Sun you get some thematic Spells. Burning Hands at 3rd Level.

As a being infused with some Power of the Sun you get some thematic Spells.Scorching Ray at 5th Level.

As a being infused with some Power of the Sun you get some thematic Spells. Fireball at 7th Level.

As a being infused with some Power of the Sun you get some thematic Spells. Wall of Fire at 9th Character Level. 

As a being infused with some Power of the Sun you get some thematic Spells. Dragon Spirit at 13th Level.

As a being infused with some Power of the Sun you get some thematic Spells. Immolation and Flamestrike at level 15.