you throw a clay ball to a point you choose within range and then suddenly expands into a huge ball of clay. Each creature in a 20-foot-radius Sphere centered on that point makes a Dexterity saving throw, having their speed reduced to 0 and being stuck in the ball of clay on a failed save or not on a successful one.

Immediately after the ball expands, it becomes affected by gravity, acting like a nonmagical ball of clay.

At the end of the duration, the ball vanishes, leaving creatures and object stuck in it in the space it once occupied.