Glorious Clash

When you take the Attack action you can make a contested melee attack roll with an opponent in melee range. The opponent must be wielding a weapon or have a natural weapon. If you win the contested attack roll the target takes damage equal to the number, they lost by plus your highest-class level, with the damage type being the damage of the attack used.

If you lose a glorious clash the same damage calculation happens to you, and you cannot clash again until you finish a short or long rest, or if you use a bonus action to expend a hit die to regain Glorious clash. 

When you gain the extra attack feature you can repeat this special attack roll an additional time(s) equal to your additional attacks as part of the same action. This can target the same creature or a different creature within melee range with the same criteria. 

This attack also cannot be used on a creature that is incapacitated or otherwise unable to take actions. 

This is a class feature made into a feat for all classes, credit goes to Smuag on the subclass "Adept Duelist (Revised)" - 10/17/2021.