Path of the Damned

Whether it be an ancient curse placed upon your family by a rival or some Eldritch horror claiming vengeance upon you or some other holy or unholy interference, you have been condemned to eternal damnation and that gives your rage powers beyond understanding as your curse spills over into the souls of others. You are beyond salvation, your enemies will not be saved, and nothing stays in your way.

Mark of Corruption

At 3rd level, your attacks leave their sufferers touched with a remnant of your blemished nature. Whenever you hit a creature with a melee weapon attack while you are raging, you can spend a bonus action to bestow upon them a Mark of Corruption. A marked creature that targets another creature other than you with an attack takes necrotic damage equal to 1d4 plus your rage damage before they can make their attack roll. The damage die used for the mark increases to 1d6 at 6th level, 1d8 at 12th level, and 1d10 at 17th level.

If the target is a spell-caster using cleric, paladin, or warlock spell slots and casts a spell of first level or higher while marked, the caster must make a saving throw using their spell-casting ability (the DC of which is equal to your Mark of Corruption damage plus 10). On a success, they take the full mark damage you rolled. On a failure, they take half damage, but the triggering spell fails and the slot is wasted.

The mark lasts for one minute but ends early if you mark a different creature or your rage ends. You may only create a number of marks equal to your Constitution modifier before taking a long rest.

Eternal Mark

At 6th level, you can spend an action and force a marked target to make a Constitution saving throw, the DC of which is equal to 8 plus your proficiency bonus plus your Strength modifier. Upon a failure, the mark's duration becomes three days and will not end early unless the target dies or is affected by a Remove Curse spell or other effect that remove curses. However, doing so links you to that target. Whenever the creature takes damage from your mark, you take equal damage.

You can use this feature once every long rest.

Call of the Condemned

At 10th level, you learn to call upon similarly damned entities as an action and force them to serve you. These creature(s) must be of one on the following types: Celestial, Fey, Fiend, or Undead. You can call upon any number of creatures as long as the combined Challenge Rating of your summoned entities equals one fifth of your Barbarian level rounded down (for the purposes of this feature, creatures with a CR of 1/4 or lower count as CR 1/2). They disappear after one hour or whenever you use this feature again.

You command the summoned creatures telepathically without needing an action, but not during the turn you summon them. You can use this feature twice per long rest.

Alternative Rule: If your DM allows it, the creatures you summon can be any creatures that have died while marked by you in any way, as long as you comply with all other rules.

Duel of Wrath

At 14th level, you can use your curse to damn a single combatant and begin a duel. Choose a creature within 100 feet of you. Any attacks made by other creatures against both you and that target have disadvantage and the attacker takes damage from your mark damage. Any attack you make against a creature other than your target of this feature has disadvantage and a successful attack causes you to suffer your mark damage. Any attack made by the target against any target other than you automatically fails. This effect lasts until either you die or your target dies. You can only use this feature once, resetting at dawn.