This spell increases or decreases gravity in a 20-foot-radius cylinder centered on a point within range. 

Increase Gravity. The ground within the cylinder is difficult terrain. If a creature ends a fall within the cylinder, it takes 2d6 bludgeoning damage for every 10 feet it fell, to a maximum of 40d6. A creature who ends its turn in the cylinder must make a Strength saving throw. On a failed save the creature takes 1d10 bludgeoning damage, on a successful save, it takes half damage.

Decrease Gravity. Within the cylinder, jump distances are tripled. If a creature ends a fall within the cylinder, it takes 1d6 bludgeoning damage for every 20 feet it fell, to a maximum of 10d6.