Patient Blade

A fighting style used by those with the heart of a pacifist but possessing the will to kill. Avoiding pointless attacks and learning about your opponents you gain the upper hand in combat and deal devistating strikes at leathal points.

Uncanny Movement

at 3th level you gain the ability to gage your opponents movements in combat allowing you to dodge attacks that would have otherwise hit you, as a reaction you can consume a charge of "Uncanny Movement" (equal to dexterity modifier) to add a dice roll to AC ([roll]1d6[/roll]) at lvl3, ([roll]1d8[/roll]) at lvl6, ([roll]1d10[/roll]) at lvl9, and ([roll]1d12[/roll]) at lvl12.

Keen Eye

6th level while "Uncanny Movement" is active you have learned to observe your opponents when dodging attack exposing weaknesses in their defense's. Every attack you dodge grants you a boon on your next attack stacking up to 5 times. You consume these boons with your next attack made (all boons are lost if you are hit with an attack)

1: Your attacks have advantage. You may activate your sneak attack the next time an attack connects, regardless of advantage or disadvantage.
2: Your walking speed increases by 15 feet, and you can disengage as a free action.
3: The next time an attack lands, it deals an additional 1d8 (2d8 at lvl11) damage.
4: You have advantage on saving throws against all spells and magical effects.
5: You can treat the attack roll of your next attack as a 20.

Fortitude of Mind

At 9th lvl you gain charges of fortitude equal to proficiency bonus + Dexterity mod replenished on long rest you can spend these charges to not lose "Keen Eye"  stacks when hit. However, you do not gain the next boon in sequence when a charged is used to prevent stacks from being lost.

Watcher of the Damned

All your life you have been studying your opponents in battle having done this you can now gain info about them in subtle ways that they carry themselves in day to day dealings. Starting at 13th level you can observe a target for 1 week. Upon doing you can make an attack on this target if they are surprised make the attack with full benefits of five stacks of "Keen Eye" 

Dealer of Death

17th lvl on the 6th dodged attack with "Uncanny Movement" all subsequent attacks you dodge after this you can retaliate with an attack without consuming boon charges. (charges are still lost when you attack on your turn like normal)