Blue Fireball

A streak of blue flashes from your hand to a point you choose within range and then blossoms with a loud roar into an explosion of blue flame. Each creature in a 50-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 10d10 fire damage on a failed save, or half as much damage on a successful one. 

The blue flame spreads around corners. It ignites flammable objects in the area.  (DM's choice if it burns items a player is carrying) 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 2d10 for each slot level above 4rd.