Tendrils of Ensnarement

Target any number of creatures within the spell's area. Summons forth giant tendrils and targets must make a Dexterity saving throw. On a failure, the creature is ensnared for the duration of the spell. On a success, the creature takes 3d4 - 1 poison damage. Ensnared enemies have 1/4 movement speed, cannot exit the spell's area of effect, and take 3d4 - 1 poison damage at the start of their turn each round. A creature may use its action to attempt to break the ensnarement. If it chooses to do so, it must make a Dexterity saving throw. On a success, the creature is no longer ensnared. If the caster breaks concentration, all ensnared enemies are no longer ensnared.