Retribution Domain

Revenge is a primal, instinctual act. Vengeance, without regard to mercy or forgiveness, is often ordained and favored by the divines. To trespass on the honor of life of another invites retribution for the deed, and so you shall act as an instrument of that revenge. Deities such as Nemesis, Adrestia, Ponea, Vali, Arawn, Camalus, Sekhmet, Shiva, and other deities of war, revenge, justice, balance and death may lay claim to this domain. Clerics of this manner act as warriors and killers, harbingers of the doom and destruction of those who have killed and destroyed in turn. Call upon the fury of the righteous revenge, and bring low those who have trespassed against you and your kin.

Bonus Proficiencies

When you choose this domain at 1st level, you gain proficiency with heavy armor and martial weapons.

Vindictive Reprisal

Also starting at 1st level, your fervor allows you to strike down those who try to wrong you. When you are targeted by a melee attack, you can use your reaction to attack the enemy before any of the attacks effects trigger. Provided that the enemy is within your reach.

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

Channel Divinity: Instrument of Revenge

Starting at 2nd level, you can use your Channel Divinity to help your allies take revenge on those who hurt them.

When you see a friendly creature take damage from another creature, you can use your Channel Divinity as a reaction to bless your ally. For the next 10 minutes both you and the target know the location of the creature that damaged your ally. Provided it is on the same plane of existence.

In addition, both your and your ally's attacks deal an additional 1d8 force damage against the creature.

Endless Assault

Beginning at 6th level, your deity grants you the swiftness of an avenging angel. You can use a bonus action to expend a spell slot between 1st and 5th level to grant you strength. You can make additional attacks when you take the attack action. Per twice the level of spell slot you consumed, you can attack multiple times. You can however only do 1 extra attack per turn, and when you reach level 11, the numbers of extra attacks you can make per turn, increases to 2.

This effects lasts for an hour, or until you exhaust all the extra attacks granted by this feature.

Wrathful 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 damage of the same type dealt by the weapon to the target. When you reach 14th level, the extra damage increases to 2d8.

At Any Cost

Starting at 17th level, you refuse to perish without first destroying your adversaries. When you are reduced to 0 hit points don't die outright, you can choose to immediately take an additional turn. When you do, you gain one level of exhaustion after the turn ends. If you end your turn with 0 hit points, you fall unconscious as normal, unless you use this feature again.