Engulfing Thorns

You conjure thorny vines which grow along a line 5 feet wide and 10 feet long emanating from you in a direction you choose, engulfing everything they touch. At the start of each of your turns, the length of the line increases by 5 feet in the same direction. For the duration, these vines turn the ground in that area to difficult terrain. When a creature enters the affected area for the first time on a turn or starts its turn there, the creature must succeed on a Dexterity saving throw or take 2d6 piercing damage and be restrained by the vines until the spell ends. A creature that starts its turn in the area and is already restrained by the vines takes 2d6 piercing damage and is pulled 5 feet in the direction that the vines are growing. A creature restrained by the vines can use its action to make a Strength or Dexterity check (its choice) against your spell save DC. On a success, it frees itself.