Flagellants Domain

As a way to atone for past sins or a just a morbid way of worship you have chosen to punish yourself in the name of your diety. You channel this suffering into harming thoes who go against you or bear the burden of your allies to assist them in battle.

Bonus Proficiency

When you choose this domain at 1st level, you gain proficiency with flails and whips.

Atonement

Also starting at 1st level, take a bonus action to roll 1d4. On 1-2 gain +1 to the damage or healing value of your next spell, on 3-4 gain +2. Take damage equal to the value of the roll. The value of this bonus will increase by two for every 3 levels in cleric.

Aditionally your natural armour is 13 + Wis modifier when unarmoured due to remodeling of the skin.

Channel Divinity: BloodShed

Starting at 2nd level, you can use your Channel Divinity to drain and redistribute the life force of your foes.

As an action your drain the life of chosen creatures within a 15ft radius and grant allies within the radius temporary hitpoints equal to the split total damage dealt to enemies. 

Call to repent

Beginning at 6th level, you may share your suffering. As a bonus action, choose a creature within 15ft to take half of all damage taken by the player until the start of your next turn. This damage can be nectrotic or radiant based on player choice.

Burden

At 8th level, you gain the ability to assist your allies through your suffering. You may use the "Call to repent" class feature to heal an allie within the radius in addition to damaging an enemy. The healing is equal to the base damage of "Call to repent" before resistance and immunities. 

Communion

Starting at 17th level,  Once per short rest you may call all to communion. "Call to repent" now effects all chosen creatures within range, with the player choosing who is healed and who is harmed.

Additionally "Call to repent" range increased by 15ft