Devouring Plague

Using the material components the caster creates a circle on the ground that is filled with an aura of death and decay causing 1d 10 necrotic damage to all inside the 25ft radius of the spell . The area of the spell effects the location for 1 hour ( 10 rounds) . 

effected targets can make a DC 12 Con. roll to halved the damage caused , If the target fails it's saving throw it takes full damage , if the targets hit points are reduced to below zero and the target is still within the effected area the target is  devoured by the plague. ( no death saving throws ) . * AOE*