A brilliant silvery comet erupts from your outstretched palm in a line 60 feet long and 5 feet wide in a direction you choose. Each creature in the line must make a Dexterity saving throw. On a failure, a creature takes 6d6 radiant damage, followed by 3d6 cold damage at the start of their next turn as the tail of the comet streaks through them. On a success, the creature takes half as much radiant damage and no cold damage.

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