The Avenger

Be it by trickery, accident, or choice, you have entered into a pact with an ancient and powerful entity bent on revenge. Whether it be a deity long forgotten, a scorned lich, or a defeated Great One; your patron is filled with fury. You are now a tool for your patron, an extension of them, an arm to be used to enact their vengeance upon whoever or whatever has wronged them. In return, the Avenger gives you access to their other tools. Unlike other patrons, Avengers want to have a direct hand in their work. They will magically heighten your emotions in order to influence or even take control over your actions when using their gifts.

Wrath of the Scorned

Starting at 1st level, The Avenger's anger is overwheling to mortals. When you take damage while wielding a tool of the Avenger (Arm of Reprisal, Menacing Countenance, Authority of Hatred), you must make a wisdom saving throw at the beginning of your next turn. The DC equals 10 or half of the damage dealt, whichever is higher. On a failed save, your actions are dictated by your patron until your next turn. If damage is taken while already under the Avenger's control, an additional saving throw to return control to you is not required. DC increases by 1 for each additional active tool. When you are extremely emotional or in any way enraged, your patron may attempt to temporarily take control of you, how this manifests is up to your GM's discretion. 

Arm of Reprisal

At 1st level, you gain proficiency with simple and martial weapons. You are also gifted with an aspect of the Avenger's tool of mutilation, The Arm of Reprisal. The Arm of Reprisal's abilities and form are magically grafted onto a melee weapon. This feature can be used a number of times equal to half your charisma modifier per long rest, rounded down (minimum of 1) and the mutilation ritual required to harness this Avenger tool can be activated in the following ways:

• As a bonus action, by taking 10 necrotic or radiant damage (the damage type chosen will be the damage type your Arm of Reprisal does)
• After dealing bludgeoning, slashing, or piercing damage with the melee weapon that will be imbued with the Arm of Reprisal (no action)

When the melee weapon used in the mutilation ritual is imbued with the Arm of Reprisal, it gains the following properties:

• Weapon gains a +1 bonus to attack and damage and is considered magical for the purposes of overcoming resistance and immunity to nonmagical attacks.
• Weapon deals its normal damage and an additional 1d4 necrotic or radiant damage. Enemies that have dealt damage to you take an additional 1d4 on top of the extra damage (damage increases to 1d6 at level 5, 1d8 at level 11, and 1d10 at level 17)
• You can use your Charisma modifier, instead of Strength or Dexterity, for the attack and damage rolls

If you later gain the Pact of the Blade feature, you can take the required damage when summoning your pact weapon and it will gain the features of the Arm of Reprisal. 

Menacing Countenance

At 6th level, you've gained access to the another of the Avenger's tools, their terrifying appearance. As a bonus action, you can take 10 necrotic or radiant damage and take a form reminiscent or representative of your patron. If a devil you may gain fangs and horns, if an undead being your flesh may rot and wither, etc. This form lasts a minute, until dropped (no action required), or until you reach 0 hit points. This Menacing Countenance can be used a number of times equal to half your Charisma modifier, rounded down per long rest, and grants you the following benefits:

• Your AC increases by 1
• You gain advantage on Charisma (Intimidation) checks
• If a creature deals damage to you, you can use your reaction to allow your patron to reveal their true form to them through your appearance. The creature must make a wisdom saving throw or take 2d6 + your charisma modifier as psychic damage (half on a successful save) and be frightened of you until the end of your next turn. Creatures who can't see are immune to this effect. This damage increases to 2d8 at level 11 and 2d10 at level 17.

Authority of Hatred

At level 10, your anger is nearly indistinguishable from that of your patron's and you've gained the ability to wield their final tool. As an action, you can take 10 necrotic or radiant damage to don the Authority of Hatred which takes the form of a crown, cape, halo, and/or wings that represent the unique domain of hatred that the Avenger embodies. You emanate a 20 foot aura of menace for a minute or until you reach 0 hitpoints. This tool can be used once per long rest and has the following effects:

• You have advantage on attacks and spell attacks against frightened creatures in the aura
• You are immune to the frightened condition while the aura is active
• As a bonus action, you can cause all creatures in the aura who have dealt damage to yourself or allies to make a wisdom saving throw or take 2d8 + your charisma modifier as necrotic or radiant damage (2d10 if wielding another Avenger tool). Frightened creatures have disadvantage on the saving throw. 

Avatar of Vengeance

At level 14, you can activate an Avenger's tool without taking damage, even if the use of the tool has been expended already. If a tool is activated using this feature, you gain resistance to nonmagical bludgeoning, slashing, and piercing damage until the start of your next turn. This feature can be used once per long rest.