(Note: this isnt supposed to be a feat, but a reaction you can take when using finesse weapons)
When you get attacked, you can react with a counterattack to try and parry the attack. As a reaction to being attacked, you can roll a D20 and add your dexterity modifier + your proficiency bonus if you are proficient at using the weapon you parried with. If you roll a nat 20 it's 2x your dex and proficiency bonus instead, and you also get +3 to the roll. If the roll result is higher than the attack damage, then you parry it succesfully, reducing the damage by (your roll-enemy damage). If the enemy damage is negative after reducing it, then it deals it to itself. If you fail the damage doesn't get reduced. You can only parry an enemy hitting you with a melee attack, and the enemy can't be a size bigger than you.
Example: Enemy hits a rogue, rolls 14 on damage. The rogue (dex bonus = +4, Pb = +3) parries and rolls 25. 25 - 14 = 11, so the damage gets reduced to 3.
Example 2: Enemy hits the same rogue, rolls 10 on damage. The rogue parries and rolls a nat 20. 20 + 8 + 6 + 3 = 37. 37 - 10 = 27, so the damage gets reduced to 0, and he deals 17 damage to the enemy.
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