Arcane Cataclysm

You conjure orbs of magical energy that plummet to the ground at 3 different points you can see within range. Each creature within a 20-foot radius sphere centered on each point must make a DC 19 Dexterity dashing throw, taking 10d10 force damage on a failed save, or half as much damage on a successful one. A creature in the area of more than one arcane burst is affected only once. 

The area of each arcane burst then acts as an antimagic field for 1 hour. You and your spells, along with all of your equipment, are unaffected by these fields.