Truer Strike

You touch a willing creature. Once before the spell ends, the target can roll a d4 and add the number rolled to one attack roll of its choice. It can roll the die before or after making the attack roll. If the attack hits, also add a 1d4 to the damage for that attack. The spell then ends.

The spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).