The caster summons a black and purple flame powerful enough to sear the soul itself not being able to be put out by normal means like water. it has a 20ft radius, anyone in the area of the hell flame is set ablaze must roll a Constitution saving throw if failed they must take a 3d12 of damage and have a disadvantage on saving throws untill your next turn. If the roll is succsesful half the physical damage but they still have disadvantage.   if a person affected by the flame touches another person while still on fire it will spred to them too dealing 2d4.