As an action, you shift to an incredibly small size and then suddenly return to normal as make a weapon attack.
On a hit, add 1d6 + your spellcasting ability to the attack’s damage roll and if the creature is your size or smaller it must succeed on a Reflex saving throw or it is flung 2 meters away from you where it falls prone and takes 1d10 bludgeoning damage.
On a critical hit, add twice as much damage.
On a miss by 4 or less, add half as much damage.
You can increase the initial damage by 3d6, fling the creature an additional meter, the secondary damage by 1d10, and affect a creature of a larger size for each additional mana expended.