You're one of the best in the buisiness. Gain the following abilities;

Pinpoint Accuracy

Whenever you make an attack roll using your Dexterity, you can choose to spend a cunning die and add it's max value to the result of the roll.

Deadly Strike

Once in each of your turns when you deal damage with an attack using your Dexterity, you add a d6 to the damage roll. The damage increases to 2d6 at 8th Tier and 3d6 at 10th Tier.

Infallible Method

Whenever you fail an attack roll, ability check or saving throw that adds your proficiency bonus, you can reroll that check. You must use the new result. You can use this feature a number of times equal to your Intelligence modifier, and regain the ability to do so after finishing a long rest.

Legendary Talent

Starting at Tier 8, whenever you use your Infallible Method feature, you gain the following benefits:

• Legendary Skill. When you use your Infallible Method to reroll an ability check in which you add your proficiency bonus, you gain advantage on checks made with that skill for the next minute.
• Legendary Accuracy. When you use your Infallible Method to reroll an attack, you can keep rerolling attacks against that target, without spending additional uses of Infallible Method, until you attack another creature, until the target is reduced to 0 hit points or until 1 minute has passed.
• Legendary Resilience. When you use Infallible Method to reroll a saving throw, you have advantage on that saving throw for the next minute.