Bladelord

For hundreds of years the bladelords of the east have stood as a beacon of honor and swordsmanship, their blades rarely meeting an opponent that could be considered worthy of one of their masters, with recent events however, many of said masters have begun to travel the world in search of pupils in order to pass on their teachings, few know where these men actually originated from, but any man who faces a bladelord knows that he shouldn't expect to bloody his sword. Some say that the bladelords can even walk through hails of arrows without fear and fight off hundreds of opponents without suffering a single wound. Those who have faced a bladelord and lived can attest to lightning quick displays of swordsmanship, vicious bladework and unrelenting hails of needle head precision blows.

Master Duelist

The features from this Martial Archetype can only be used if you are wielding a single weapon with the finesse property and not using a shield.

Defensive Swordplay

Starting at 3rd level you gain an additional +2 ac from using defensive blade techniques to parry enemy attacks. This bonus improves by an additional +1 at level 7 and 15 as you become more and more familiar with these techniques.

Offensive Performance

Starting at 7th level, whenever you strike an enemy in melee you may add half your proficiency bonus rounded down to your armor class against melee attacks made by that enemy until the end of the round. Each individual enemy can only be affected by this feature once per round.
Additionally, if you make an attack action and make all your attacks against the same target you may use your bonus action to make an additional weapon attack against the same target.

Demoralising Mastery

Starting at 10th level, after performing a critical hit, you may spend your bonus action attempting to frighten your target with lightning quick flourishes of your weapon, the target must make a Wisdom saving throw with a DC equal to 8 + your proficiency bonus + your Dexterity modifier or become frightened of you for 1 minute, should they succeed on the saving throw they become immune to this effect for the next hour. You may use this feature a number of times equal to your Dexterity modifier per short rest (minimum of 1).
Your weapon attacks score a critical hit on a roll of 19 or 20.

Saviour's Strike

Starting at 15th level, whenever an enemy lands a critical hit against an ally within your reach you may use your reaction to make a single weapon attack against this enemy. Should your attack be successful then the enemy's critical hit counts as a normal attack.

Blur of Steel

Starting at 18th level, you have become so proficient with your unique fighting style that you add your full proficiency bonus to your ac and that of any allies within your reach against any ranged attacks as you calmly strike arrows, bolts and other projectiles, even ones born of magic, out of the air before they can reach their target.