Unerring Eye

You choose a creature within range and attempt to magically discern openings in it's defences. The target must succeed on a Charisma saving throw. On a failed save, you gain a bonus to attack rolls made against the target equal to half your spellcasting modifier, rounded down.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can choose to allow a number of friendly creatures within range to gain the bonus to attack rolls against the target. You can extend this benefit to one additional creature besides yourself per slot level above 2nd.