You launch an expanding drop of water at a target which may be no larger than large. The target makes a strength saving throw, on a failed save the target is engulfed it in a spherical cage made of water which hovers 5 ft above the ground. The target is grappled while in the cage. On your turn you may move the cage and the target within 30 ft. as a bonus action. On it's turn the target may attempt a strength athletics check as an action to break free, the dc of this check is equal to your spell dc. If you ever move the cage beyond the range of this spell the effect immediately ends. 

This spell was inspired by the spell of the same name from the Svilland campaign setting source book