Sole Survivor

You learned a thing or two from being the sole survivor of a murdering spree.

Survival Instinct

Also at 3rd level, your survival instinct leads to you always being alert. You gain expertise in the Perception skill if you don't already have it. 

Adrenaline Rush

When you choose this archetype at 3rd level, your body reacts as quickly as you do, sending adrenaline through your body to allow you to fight for longer.

When you roll initiative, you lose any debuffs you may have had for the duration of Adrenaline Rush. When under the effects of Adrenaline Rush, any debuffs gained during this time have no effect until Adrenaline Rush ends. Adrenaline rush lasts for 1 minute and ends early if you are knocked unconscious.

One on One

You are used to having to hold your own against an enemy.

At 3rd level you gain an additional way to use your Sneak Attack; you don’t need advantage on the attack roll to use your Sneak Attack against a creature if you are within 5 feet of it, no other creatures are within 5 feet of you, and you don’t have disadvantage on the attack roll. All the other rules for Sneak Attack still apply to you.

High Alert

At 9th level, you have experienced dangers that surpass anything you have seen in the past, and as such have adapted to be more prepared for them.

While not incapacitated, you gain a bonus to your Initiative bonus equal to  your Proficiency bonus. Additionally, your Adrenaline Rush now only ends when initiative ends.

Heightened Response

At 13th level, thanks to the adrenaline surging through your veins, your natural responses to danger have been heightened.

While you are under the effects of an Adrenaline Rush you gain one of the following effects:

Fight. You gain a bonus to damage rolls equal to your proficiency bonus. In addition you may reroll any 1s or 2s when rolling damage.

Flight. Your AC increases by 2. In addition you may take the Dodge action as a bonus action.

As a bonus action, you may switch between fight and flight. When you do so, you take an exhaustion point.

Adrenaline Surge

Starting at 17th level, you can strike with deadly speed. When you are below half health, if you take the Attack action on your turn, you can make one additional attack as a bonus action. This attack can benefit from your Sneak Attack even if you have already used it this turn.