As an action, a ravine of gravitational force shoots out. Each creature in a cone or line must make a Reflex saving throw.
On a failure, it takes 3d4 concussion damage, is slowed 1 until the end of its next turn, and is pulled 2 meters toward the center of the area if it is Medium or smaller.
On a critical failure, it takes twice as much damage, is slowed 2 until the end of its next turn, and is pulled 4 meters toward the center of the area if it is Medium or smaller.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
You can increase the damage by 2d4, pull the creature an additional meter, and affect a creature of a larger size for each additional mana expended.