Base Class: Cleric
Clerics of a god of light are enlightened souls infused with radiance and the power of (heir gods' discerning vision, charged with chasing away lies and burning away the darkness.
Light Cantrip
When you choose this domain at 1st level, you gain the Light cantrip if you don't already know it.
Disciple of Light
Also starting at 1st level, you gain resistance to Necrotic damage.
Channel Divinity: Radiance of the Dawn
Starting at 2nd level, you can use your Channel Divinity to harness sunlight, banishing darkness, and dealing radiant damage to your foes.
As an action, you present your holy symbol, and any magical darkness within 30 feet of you is dispelled. Additionally, each hostile creature within 30 feet of you must make a Constitution saving throw. A creature takes radiant damage equal to 2d10 + your cleric level on a failed saving throw, and half as much damage on a successful one. A creature that has total cover from you is not affected.
Blessed Healer
Beginning at 6th level, the healing spells you cast on others heal you as well. When you cast a spell of 1st level or higher that restores hit points to a creature other than you, you regain hit points equal to 2 + the spell’s level.
Divine Strike
At 8th level, you gain the ability to infuse your weapon strikes with divine energy. Once on each of your turns when you hit a creature with a weapon attack, you can cause the attack to deal an extra 1d8 radiant damage to the target. When you reach 14th level, the extra damage increases to 2d8.
Avatar of Light
At 17th level, you gain resistance to bludgeoning, piercing, and slashing damage from nonmagical weapons.