Conflagration

A glowing pillar of burning energy erupts forth from your chest connecting to one creature you can see within range. The target must make a Dexterity saving throw. It takes 4d6 fire damage on a failed save, or half as much damage on a successful one. On a failed save, the targets speed is also halved as the intense heat weakens it's muscles. Additionally at the start of each of it's turns, the creature takes 4d6 fire damage plus an additional 4d6 fire damage for each turn Conflagration has been active. 

If damage from this spell kills a target, the target is turned to ash.