Teacher Itswalls Fireball

Teacher Itswalls had a dream to be able to make the fireball spell more effective and more accessible for lower level Wizards. But before he could finish his research he dissappeared. The spell he left behind are only known to a few, for good reason. The spell can be cast with a second level spellslot instead of a third but suffers in reliability for it. When casting the spell, roll a d20. On a 2 it fizzles out into nothing. On a 1 it blows up in your hand, doing the dmg centered on you instead.

A bright streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 fire damage on a failed save, or half as much damage on a successful one.

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 this spell using a spell slot of 3th level or higher, the damage increases by 1d6 for each slot level above 2rd.