Clerics of Penance

Clerics of penance for those who have sinned beyond The ability to be forgiven trough normal means. Pain and conversion are the only way that they can fine redemption and hopefully salvation. 

Forgiving lash

When you choose this domain at 1st level, you have half of your total hit points Converted into temp hp. (A character with 50 health would have 25 actual health and 25 temporary hit points)

Weapons of the exiled

At 1st level, You gain proficiency with flails, whips and crossbows, and may add your constitution modifier to damage roles.

Channel divinity: Break the spirit

At 2th level, you can use your Channel Divinity to choose one targets to focus on, they take 1D10 psychic damage per turn for 2 rounds. If the target is immune to psychic damage they have to roll a constitution saving throw or be stunned till of the start of your next turn. 

At the cost of 4 temp HP increasing by two every three levels. 

You can use this feature a number of times equal to your Constitution modifier (minimum of once). You regain all expended uses when you finish a long rest.

Prolonged Exposure

At 6th level, you gain the ability to expedite death’s progress. As a reaction when a enemy that you can see within 30 feet of you suffering from a status effect, has there of effects extended for one extra round.

At the cost of Five temporary hit points increasing by five for every two levels after.

You can use this feature a number of times equal to your Constitution modifier (minimum of once). You regain all expended uses when you finish a long rest.

Tortured Graps

Starting at 8th level, you can inflict wounds to the damage you deal with any melee attacks. 

At the cost of six temporary hit points.

Covenant

At 17th level you gain the ability covenant. You channel energy in 20ft aura around you, allies in the radius boast ac +6 as well giving advantage on their attack rolls, enemies in radius take extra damage from attacks equal to cleric lvl plus wisdom mod.