This spell was originally stumbled upon by the Ithusian Sabbath chapter of Balase Stock-Lamont, though it has since become one of her favourite spells to incapacitate people she doesn't want to hurt, but needs to stop, with. Essentially, it targets the mammary glands and causes them to swell, gaining in mass until the recipient is unable to move because they have fleshy boulders on their chest. The effects can be dispelled with magic, but if the dispeller does not know what they should be doing then the spell can run wild as evidenced in 'The Renaissance'.
Due to that, the spell has been banned by the Fae in NeverNeverLand as hideously engorged man-boobs threatened to crush their island home.