Lodestone Shield

This Lodestone Shield was made by a Dwarf and a crazy Artificer. 

Returning: As a bonus action, you can call your shield back to your arm within 30ft

(3/Day) Magnetic Field: As an action, you can violently attract and repel unattended metal objects within a 30ft sphere. Attracted objects stop just short of your shield before falling harmlessly, the combined objects cannot weigh more than 300 pounds.

You can choose instead to focus on one wielded metal object, such as armor or a weapon, within 30ft. The attendee must succeed on a strength save against a DC 10 + your Proficiency bonus. On a fail, they are disarmed or pushed/pulled 20ft.

Shields require the Utilize action to Don or Doff. You gain the Armor Class benefit of a Shield only if you have training with it.