Using analytical precision, you magically train your sights on a point you can see within range. You make an intelligence check with with a DC of 13. As an action of each of your subsequent turns, you can choose a point you can see within range and repeat the check. If you succeed the check, the point is considered calculated for the duration. If you calculate a new point, the old one is no longer calculated.

When you make a ranged attack roll against a target within 10 feet of the point while it is calculated, you automatically hit.