Arrow Enchanter

Skilled eldritch archers can subvert their arcane power to enchant the conjured arrows with rings of eldritch symbols and energy that form around their weapons as they fire. 

Whenever you make a ranged weapon attack, you may choose to expend a 1st-level spell slot or higher to enhance the attack to be empowered or unerring. You cannot enhance more than one attack in a turn in this way.

Empowered. An empowered shot deals an additional 2d6 force damage, and an additional 1d6 force damage for each spell slot level above 1st. 

Unerring. An unerring shot gains a +2 bonus to the attack roll, and an additional +2 bonus for each spell slot level above 1st.