Ears of Corn

When the spell is casted, the target of the spell will be deafened, as corn sprout and mature instantaneously from the ears or other source of hearing for the target. The target is subjected to deafening.

If the ears of the target come in contact with fire or immense heat. The ears of corn pop. 1d6 fire damage to everyone in a 20ft radius who fails a dexterity saving throw. The fire damages objects in the area and ignites flammable objects that aren't being worn or carried. 

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the base damage increases by 1d20 for each slot level above 7th.