Arituk's Frozen Sphere

You summon forth a sphere of ice within range, that is hollow, but cannot contain anything that is alive on purpose. You can use a bonus action to move this sphere around, with a flying speed of 60 ft. You can summon this sphere, or order it to, go around to an object and envelop itself in this object, to hold onto it. If the object in question is being held on to, the target has to make a Strength saving throw, or be unarmed, if it is a weapon. It can also drop whatever it holds, as a bonus action.