Uncanny Precision

Perquisite: Must have a Dex of 15 or higher.
The accuracy of some is legendary. Proving their amazing capabilities of their accuracy. They have uncanny aim with attacks that use precision rather then brute force. You gain the following benefits:  

Increase your DEX, INT, WIS or CHA by one point, up to a maximum of 20.

Whenever you roll with advantage on an attack roll using, DEX, WIS, INT, or CHA. You can roll one of the dice once!