Disrupt

With a strange gesture and a rambling rendition of the incantation, the caster disrupts the proper balance of internal organs and cause the victim's body to twitch and bulge in disturbing ways. The subject must succeed at a constitution save or have disadvantage on their next attack roll.

and suffer 1d6 of bludgeoning damage and increase in power at 5th level (2d6), 11th level (3d6), and 17th level (4d6).