Vengeful Light domain

The radiant glow of the sun in recent years has grown red. The gods have grown Vengeful. Malicious. Hateful. Their light now still used to purify the dark. But with more violent and scorching methods. I suppose as the creatures of the dark grow and grow. The gods of light have to resort to more...Brutal methodology in order to keep up. Or they may have become corrupted. Now imbuing those that followed them with the power of Scorching Vengeance. Though that isn't to say all Vengeful light clerics are bloodthirsty maniacs that want nothing more than to burn anyone opposed to them

Warrior of Corrupted light

At first level. You gain proficiency in Heavy armor and martial weapons. You also gain the light cantrip if you don't know it. 

Expanded spell list

You also gain a expanded spell list to burn any darkness you might come across

level 1: Burning hands. Hellish rebuke. 

level 3: Erupting earth. Fear. Scorching ray

level 5: Fireball. Immolation

level 7: Wall of Light. Negative energy flood.

level 9: Delay blast fireball. 

Sacrificial Retribution

Also at level 1 upon picking this subclass. You feel only a dose of the Vengeance of a Light god. When a creature attacks you. You can use your reaction to flare up with a burning. Vengeful flame. That creature must make a Wisdom saving throw (Based on your spellcasting mod) Or take 2d6 Radiant damage.+Your Wisdommodifier and be frightened for a round. You can use this a certain number of times based on your wisdom modifier. You regain all uses on a long rest. 

Channel Divinity: Blood Suns Judgement

At level 2 in this subclass: Your weapon radiates with the anger of a light god. Glowing a sickening. Spiteful red. As a bonus action, Dealing  You slice the palm of your hand. Dealing 1d6 damage to yourself (This damage cannot be reduced) However in exchange for one minute. Your weapon attacks now deal 2d8 fire or Radiant damage. At level 6 and 14 both damage you deal to yourself and damage you deal increase. You also gain additional uses at level 6 and 18

Flaring Judgement

Your Blood suns Judgement deals Fire damage 

Radiant Judgement

Your Blood suns Judgement deals Radiant damage 

Relentless Hunger

At level 6 in this subclass. Your hatred courses through your body and veins in the midst's of combat. You are able to make two attack actions with a martial/simple weapon. Additionally one of those attacks can be a cantrip

Malicious Cantrips

At level 8 in this subclass. You infuse your cantrips with the flames of hate to blight your foes. Once on your turn. When you hit a creature with a cantrip, you cause the attack to deal a additional 1d6 fire damage to the target. At level 14 this increases to 2d6.

Paragon of Incineration

At level 17 you become a Avatar. A second deity of the Vengeful. Scorching light. As a action you able to glow with a radiant red light. While in this state you ignore resistance to fire or Radiant damage. Additionally half of the damage you deal with a spell or weapon attack is added as additional damage (Ex. Deal 12 damage. You add a additional 6 damage on top of it)