You alter the air in a 15-foot-radius, 30-foot-high cylinder centered on a point you can see within range. Within the cylinder, air becomes viscous and takes on some of the properties of water. Creatures inside the cylinder move and fight as if underwater, and objects that aren’t being worn or carried float or sink to the top or bottom of the cylinder as if underwater. Creatures can move vertically within the cylinder as if swimming in water.   Though the cylinder acts like water, it is still air. Creatures and objects within the cylinder don’t have resistance to fire damage from being fully immersed in water, and creatures that breathe air can breathe normally while inside the cylinder. This spell has no effect if cast on a point underwater, and any part of the cylinder that is underwater has no special effect.   When the spell ends, any creature above the ground that doesn’t have a flying speed falls, taking falling damage as normal.