Aquan Sorcery: Entangling Waves

You create a cordon of sticky, entangling waves in a 40-foot cube centered on yourself. Creatures in this cube must make a Strength or Dexterity(your choice)saving throw, taking 4d8 acid damage plus 2d6 bludgeoning damage and becoming restrained on a failed save. A creature may repeat the saving throw at the end of every other turn it takes, breaking free on a success. In addition, while trapped in the waves, a creature takes 2d6 acid damage at the start of its turn. In addition, a creature that fails a saving throw to break free takes 1d6 bludgeoning damage plus 1d6 acid damage