Ancestor's Storm

You spark the storm of legends past and focus it on an point within range with a spherical radius of 30ft. Creatures in the area, must make a Constitution saving throw or take 15d10 +50 lightning damage and be stunned for one minute, or take half as much damage on a successful save and not be stunned.

Stunned creatures can repeat the saving throw at the end of their turns.

When you cast this spell at 9th level, the damage increases by 5d10.