Dazzling Beam

A beautiful glimmering beam of blinding light streaks toward a creature within range. Make a ranged spell attack against the target. On a hit, it takes 1d8 radiant damage. When this beam hits an Undead creature, its warm radiance rips into the creature with vigor and instead deals 2d6 radiant damage. 

The spell's damage increases by 1d8 or 2d6 when you reach 5th level (2d8, 4d6), 11th level (3d8, 6d6), and 17th level (4d8, 8d6).