You draw moisture from all around you, including from the clouds above, to form a massive vortex of water within a 40-foot radius, 20-foot high cylinder within range, which lasts for the duration.   Each creature within the vortex must make a Strength saving throw at the start of each of its turns. A creature that enters the area for the first time on a turn must also make this saving throw. On a failed save, a creature takes 8d10 bludgeoning damage and becomes trapped in the vortex, unable to move for the rest of the turn. On a successful save, a creature takes half as much damage, but suffers no other effect. An affected creature at the center of the vortex is restrained until the spell ends, and takes an extra 2d10 damage each time it fails a saving throw against the vortex.   A creature stuck in the vortex must make a Strength check against your spell save DC at the start of its turn. On a success, it can move by swimming through the vortex this turn, and it is no longer restrained if it is at the center of the vortex. Otherwise, it is pulled 10 feet towards the center.