Ultimate Rasengan

You form a sphere of energy in your hand and launch it towards a point you choose within range and then bursts with a loud roar into an explosion of force. Each creature in a 30-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d12 force damage, and 8d10 damage of your choice between bludgeoning, slashing, or piercing, on a failed save, or half as much damage on a successful save. 

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 1d12 and 1d10 for each slot level above 7th.