Belly Goobles

You give a creature in tangle the evil, nasty, awful, belly goobles. As part of the bonus action when you cast the spell and again as a bonus action on any or each of your turns for the duration, you can cause the target to make a constitution saving throw. On a fail, it’s belly goobles alarmingly and it takes 1d6 poison damage & has disadvantage on its next roll of the d20. 

At higher lvls

when you upcast this spell, the damage increases to an amount of d6’s equal to half the slot level you cast it with.