Burning Soul

A beam made up of pure  roaring flame shoots out from the character's body. The beam is a 10 ft cylinder that burns small to medium creatures, instantly killing them. if target is large creature, target will take 10d10 burning damage on top of 2d6 fire damage, if wearing something flammable,  until the target puts themselves out. 

The fire damages objects in the area and ignites flammable objects that aren't being worn or carried. If you choose, plant life in the area is unaffected by this spell.