Coral Grasp

You conjure coral that grows around a creature’s leg or other body part. Choose a creature within range that you can see. The target must roll a Strength saving throw; on a failed saving throw it suffers 4d6 poison damage and its speed is reduced to 0. On a success, it suffers half damage and no additional effect. At the end of each of its turns, the target can choose to suffer 2d6 poison damage and roll a new Strength saving throw. On a successful saving throw, the spell ends. The spell also ends if the target teleports out of the space it currently occupies.

On any turn during the spell’s duration, you can grow more coral on the target as an action. The target rolls a Strength saving throw; on a failed saving throw it suffers 4d6 poison damage, it is restrained, and the poison damage it suffers for attempting a Strength saving throw at the end of its turn increases by 2d6. On a success, it suffers half damage and no further effect (its speed remains 0).