A brilliant beam of blue-white energy streaks toward a creature within range. Make a ranged spell attack against the target. If successful, the target takes 1d8 + [Charisma Modifier] force damage, and it is knocked back 5 feet.  The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).  Each time the damage increases, the knockback is also increased by 10 feet.