Anvil

This spell creates a square horizontal plane of force, 3 feet wide and 1 inch thick, that floats up to 5 feet above the ground in an unoccupied space of your choice that you can see within range. The plane remains completely stationary for the duration, and can hold up to 500 pounds. If more weight is placed on it, the spell ends, and everything on the plane falls to the ground.

If you move more than 20 feet from the plane, the spell ends.