Vahn's Cataclysm

A swirling mass of dark clouds and purple lightning appears in the sky above the area you cast it. 6 tornadoes of black winds and flashing lightning appear at 6 locations within range. All creatures within 30ft by 1000 ft column area of each tornado must make a Dexterity saving throw or take 8d10 Lightning damage and and 6d10 bludgeoning damage on a failed save, or half the damage on a successful save. Any creature that moves into or ends it's turn within the area of a tornado also must make this save. Any creature wearing metal armor within the spell range but not in an area not designated by the caster must roll a D6 and on a 1 a bolt of purple lightning lances down and strikes them for 3d10 lightning damage.

Structures not made of stone, trees, and most vegitation within the area of the spell are destroyed, and if a stone structure is hit by a tornado it takes significant damage or is destroyed, as determined by the DM.