Baalzebob's hunger

You inflict all creatures within a 30ft radius sphere with gluttony and ravenous hunger. All  creatures within a 30ft radius sphere with a center of your choosing within range must make a constitution saving throw on a fail being overtaken by hunger. A creature under the affects of this spell must consume something each round or take 2d6 necrotic damage as thier hunger consumes them. If a creature under the affects of this spell goes an hour without eating anything they must make another constitution saving throw gaining two levels of exhaustion on a fail. If a creature under the affects of this spell goes an entire day without eating they are transformed into a goul.

At higher levels when cast at 7th level or higher the amount of necrotic damage increases by 1d6 for every level above 6th, when cast at 9th level the creature gains 3 levels of exhaustion instead of just two and gains 1 level of exhaustion if they succeed.