As two actions, you reverse gravity in a cylinder twice as big as normal centered on a point within 20 meters. All creatures and objects that aren’t somehow anchored to the ground in the area fall upward and reach the top of the area when you cast this spell. A creature can make a Reflex saving throw to grab onto a fixed object it can reach, thus avoiding the fall.
If some solid object (such as a ceiling) is encountered in this fall, falling objects and creatures strike it just as they would during a normal downward fall. If an object or creature reaches the top of the area without striking anything, it remains there, oscillating slightly, for the duration.
When the spell ends, affected objects and creatures fall back down.