Duelist

The Duelist Fighter is an honorable fighter that prefers to fight a target alone or in single combat so that they may prove their prowess over the creature. To win epic battles and have bards tell their tales across the world is a fine goal for a Duelist.

As a Duelist you will be soloing out key targets and engaging them while your party mops up any additional prey, you become a monster in single combat to be feared by even the greatest foe. The Duelist will relentlessly go through each opponent until none remain.

Bonus Proficiency

At 3rd level, you gain proficiency in one of the following skills of your choice: Intimidation, Persuasion or insight. Becoming proficient in your own particular ways of forcing a duel.

The Duel

At level 3, as a bonus action you can attempt to force a creature within 10 ft into focusing solely on yourself, they must make a DC 12 + Proficiency Modifier Wisdom saving throw or be compelled to duel you, they will move 10 ft towards you as long as terrain allows it. Alternatively you may request a duel from a creature, some honorable foes or cocky opponents may take you up on this. A dueled creature has disadvantage on any attacks against creatures other than you and provoke an attack of opportunity if they do so.

Thrill of the Duel

Also at level 3, you gain a rush of adrenaline from being in a duel, it surges through your body and drives you to excel. Whilst in a Duel with a target you gain 1d4 bonus damage (type based on your weapon damage) on each attack action. Additionally you gain advantage on the first attack in each new Duel.

The bonus damage from this feature increases based on level,  increasing to  2d4 at 7th level, 3d4 at 10th level and 4d4 at 15th level. 

A Coward Flees

At level 7, You are shocked and enraged that an opponent may attempt to run away from you, regardless of a duel situation, a true warrior never retreats. When an opponent moves out of your attack range, you may take an additional attack of opportunity against that target. Each hit you land on a pathetic fleeing target decreases their speed by 10 ft.

A Fearsome Warrior

At level 10, all who are in your party admire your courage and bravery, this cannot be said for your enemies who see you as some ungodly death machine that will come for them next. Upon defeating a creature in a duel, all creatures that can see you must make a DC 18 Wisdom saving throw, becoming frightened on a failure, they may make a saving throw at the end of each of their turns against the fright. Creatures that are compelled to duel but frightened will still move towards you but take 4d6 Psychic damage as the horror sets in that they are next.

Perfected Dueling

At level 15, you have mastered the art of soloing out a target and picking them apart, all who try to interfere are knocked to the wayside. When a creature attempts to interrupt a duel, you may as a reaction make a special melee attack against them with your body, this has +5 to hit. Upon hitting a creature with your special melee attack, they take 1d4 bludgeoning damage and you move into their space (as long as you remain within combat with your Duel target), the creature is knocked back 10 ft away from you, if they collide with a wall they take an additional 1d12 damage. You can potentially do this to your allies if honor demands of it. 

Finishing Blow

At level 18, you can go from one duel to the next after finishing an opponent, swiftly dealing with weaker combatants. The last attack you make each combat becomes an attempted finishing blow so long as you are engaging the target in a duel, the creature takes an additional 2d10 damage. If you kill a creature on your turn, you can make an additional half your movement towards another hostile creature in range, instantly forcing them to duel you and granting you an extra attack.