Stormtrooper

Those who do battle as an elite stormtrooper uses brute force and their own fighting spirit and tenacity to break the will of their opponents. Mastery of exotic weapons and armors, stormtroopers can and will shatter the resolve of their enemies and bring entire armies to their knees. Very, very few survive an encounter with a stormtrooper, and those that do are traumatized, unwilling to take up arms against anyone ever again, for fear that the stormtroopers will find them and finish them off. 

Bonus Proficiency

When you choose this archetype at 3rd Level, you gain proficiency in the following skills of your choice: Insight, Stealth, Sleight of Hand or Acrobatics. Alternatively, you can learn an additional language of your choice.

Improved Critical

Beginning when you choose this archetype at 3rd level, your weapon attacks score a critical hit on a 19 or a 20. 

Extreme Training

Starting at 7th level, you can add half your proficiency bonus (round up) to any Strength, Dexterity, or Constitution check you make that doesn't already use your proficiency bonus. 

In addition, when you make a running long jump, the distance you can cover increases by a number of feet equal to your Strength modifier. 

Unrelenting Offense

At 7th level, you learn to fend off strikes directed against you, an ally, or other creatures nearby. If you or a creature you can see within 5 feet of you is hit by an attack, you can roll 1d8 as a reaction if you are wielding a melee weapon or a shield. Roll the die, and add the number rolled to the target's AC against that attack. If the attack still hits, the target gains resistance against the attack's damage. 

You can use this feature a number of times equal to your Constitution modifier (minimum of once), and you regain all expended uses when you take a long rest. 

Hold the Line

At 10th level, you become a master of locking down your enemies. Creatures provoke an opportunity attack from you when they move 5 feet or more within your reach, and if you hit a creature with the opportunity attack, the target's speed is reduced to 0 until the end of the current turn. 

Surgical Strike

Starting at 15th level, whenever you take the Attack action on a turn, you gain advantage against a single target in return for one level of exhaustion. If the attack connects, you deal double damage, ignoring resistance. You must take a long rest in order to use this feature again. 

Relentless Vigilance

Starting at 18th level, you respond to danger with extraordinary vigilance. In combat, you get a special reaction that you can take once on every creature’s turn, except your turn. You can use this special reaction only to make an opportunity attack, and you can’t use it on the same turn that you take your normal reaction.