Eviscerate Flesh

Your contempt for the mortal flesh is brought manifest by this spell, to wither away all organic matter on a creature of your desire. 

For a creature within your line of sight you are able to send a flash of necrotic energy surging into them to eat away at their upper layer of skin.

This creature must make a CON Save, on failure it will take 10D8 necrotic damage, half as much on a successful save. If the target is not a construct, elemental, ooze, plant, or undead, it has disadvantage on this save. If it failed its save and is none of the prior mentioned monster types, this creature will be considered undead for the duration of the spell. Any attempts to heal this creature will instead cause it harm equal to the amount of healing.