Celestial Thunderstrike

You gather the energy of a raging storm, summoning a colossal bolt of lightning from the heavens. A brilliant arc of electricity streaks down in a straight line 100 feet long and 5 feet wide, originating from you. Each creature in the line must make a Dexterity saving throw.

On a failed save, a creature takes 8d10 lightning damage and is stunned until the end of their next turn. On a successful save, a creature takes half damage and isn't stunned.

At Higher Levels: When you cast this spell using a 6th-level spell slot or higher, the damage increases by 1d10 for each slot level above 5th.