Crystal Beam

You fire a concentrated beam of light at a creature you can see within range.  Make a ranged spell attack against the creature.  On a hit, it takes 1d6 radiant damage, and it has disadvantage on the next weapon attack roll it makes before the end of its next turn.

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