Weed Bomb

When you cast Weed bomb a 30ft radius aoe plume of smoke seeps out of the ground and quickly rises to the sky. All creatures within the circle must make a Con save DC 16. All charisma checks against them have advantage. All if the creature could not be charmed before the spell they can now. After 15 minutes the creature must go and try to find food or drink and gorge themselves on it. Their movement is slowed by 10 

If the creature succeeds the save nothing happens but they do smell a strong odder. The caster can pick and choose who gets the effect with an arcana check DC 12