Doomtide

This spell creates four 10-foot cubes of swirling black mists, each filled with grasping, shadowy tentacles. You can choose which spaces the cubes occupy within range, but at least 5 feet of each cube’s outer edge must be within or next to another cube. When you cast this spell, you choose whether the mists are stationary, or whether they move away from you at a speed of 5 feet at the start of each of your turns. The mists are heavily obscured, leaving creatures caught within effectively blinded. A creature that starts its turn within the mists must make a Strength saving throw or it is grappled and restrained by the shadowy tentacles. A restrained creature can attempt a new saving throw at the end of each of its turns to break the grapple and free itself. A creature restrained by this spell moves with the mists if they aren’t stationary. The mists can be dispersed within 4 rounds by moderate winds, or within 1 round by a gust of wind spell.