Beam of Radiance

As part of casting this spell and on a bonus action each subsequent turn you may fire a 15ft long 5ft wide beam of radiant energy, enemy creatures in the line must make a Dexterity saving throw. On a failure a targeted creature takes 2d6 radiant damage and must roll a d4 and subtract for all attack rolls until the end of its next turn, on a success a creature takes half damage and doesn't have impaired attacks.

At Higher Levels.

When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.