Up to 1 minute
You create a 20' radius sphere of force centered on a point you can see in range. For the spell's duration, the sphere and any space within 100ft of it are difficult terrain. Nonmagical objects inside the sphere are destroyed if they aren't being worn/carried.
When the sphere appears and at the start of each of your turns, unsecured objects within 100ft of the sphere are pulled toward the sphere's center.
A creature that starts its turn within 100ft of the sphere must succeed on a Str sav. throw or be pulled toward the sphere's center. Upon entering the sphere for the 1st time on a turn, or when starting its turn there, it takes 5d10 force dmg and is restrained. If the sphere is in the air, the restrained creature hovers inside. A creature can use its action to make a Str check (vs your spell save DC), on itself or another, ending the restrained condition. A creature reduced to 0 hit points by this spell is annihilated, along with any nonmagical items it's wearing/carrying.
small, nine-pointed star made of iron