Crystal Casing

When you cast this spell you may take 1d6 psychic damage. This damage cannot be prevented or reduced in any way. This damage does not cause you to make concentration checks. If you do, increase the Spell Save DC for this spell by the amount of damage taken

Choose a humanoid that you can see within range. The target must succeed on a Wisdom saving throw or have its speed reduced to 0 for the duration. If the target fails their saving throw by 5 or more, they are paralyzed for the duration instead.

At the end of each of its turns, the target makes another Wisdom saving throw. If they fail the save by 5 or more, they are  paralyzed, unless they are already paralyzed by this spell. On a success, the spell ends on the target.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, you can target one additional humanoid for each slot level above 2nd. The humanoids must be within 30 feet of each other when you target them.