Athra's Word of Radiance

You utter a divine prayer, and bright radiance erupts from you unto the target(s). Each creature of your choice that you can see within range must succeed on a Constitution saving throw or take 1d6 holy radiant damage. If the spell is cast upon an undead their will weakens within them

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