Disruptive Shot

You overload your ammunition with a spark of disruptive energy and make a ranged attack against one creature within your weapons range. On a hit, the target suffers the weapon attack’s normal effects and then becomes hindered in it's focus. The next time the creature is forced to roll a saving throw until the spell ends, the creature reduces the roll by 1d4.

This spell's potency increases when you reach certain levels. At 5th level the attack's damage deals an extra 1d4 force damage and the malus to the saving throw increases to 1d4+1. Both the damage and malus increase at 11th level (2d4 and 1d4+2) and again at 17th level (3d4 and 1d4+3).