Grasping roots sprout in each unoccupied space on the ground surrounding a target within range. Until the start of your next turn, if a creature other than you willingly moves into one of the spaces, the creature must succeed on a Dexterity saving throw or take 1d4 piercing damage and have its speed reduced to 0 until the start of its next turn.   The spell’s damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).