Experimental Fireball

Following the success fireball had as a spell, many tried to make a replica much stronger. Finally, after a lot of trial and error, Experimental Fireball was made. A bright streak flashes from your pointing hand to a point you choose within range and then blossoms with a big roar into an explosion of flame. Each creature in a 50-foot-radius sphere centered on that point must make a Dexterity saving through. A target takes 10d10 fire damage on a failed saving throw, or half as much on a successful one. However, it has a 50% chance of missing. When this occurs only you make the Dexterity saving throw as a result of the spell going wrong failing with it being your spell save DC.  Additionally, you can sacrifice a spell slot to lower the odds by 10% and any spell slots that are spent are used up helping you control the spell.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast it with a 7th level spell slot it does 12d10 and lowers the odds of it missing by 10%, 8th level spell slot does 12d12 and lowers the odds of missing by 20%, and 9th level spell slot does 14d12, negates there being a percent chance to miss, and can ignite objects that are being worn and carried.