Creeping Cage

You conjure a cube shaped-cage of magical energy around an area you choose within range. The cage can be up to 20 feet on a side, with bars that are 1 inch in diameter and 6 inches apart.

When you cast the spell, any creature that is completely inside the cage's area is trapped, unless they are small enough to slip through the bars. Creatures only partially within the area, or those too large to fit inside the area, are pushed away from the center of the area until they are completely outside the area.

The cage is an object with an AC of 12 and 80 hit points. It is immune to [psychic] and [bludgeoning] damage, resistant to [piercing] damage and vulnerable to [fire] damage.

As a bonus action you can move the cage up to 15 feet in any direction along the ground of your choosing. Creatures inside the cage are moved with it.