Ark

You can use ur action to surround a creature whith in range in divine light. The creature must make a constitution saving throw or take 3d6 radiant damage. The creature can use its action to make a dexterity saving throw to escape the spell. If the creature escapes the spell ends.

A shapechanger makes its saving throw with disadvantage. If it fails, it also instantly reverts to its original form and can’t assume a different form until it leaves the spell’s light..

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.