Color Thrash

You bend the light around you creating a long strand of neon colors you can use to thrash at an enemy. Make a melee spell attack at the target, if it hits the creature take 1d6 radiant damage and in the flash of bright color is disoriented, having disadvantage on their next attack until the end of your next turn. 

The spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).