As you cast this spell, you create a cage of thorned briars that surrounds a 10-foot cube within range. The briars are thick and only allow a small amount of light and air to pass through, providing three-quarters cover to creatures within and total cover to creatures outside. You, and any others you designate, can pass through the cage at will. The briar cage has AC 10, 200 hit points, and vulnerability to fire. A creature that hits the cage with an unarmed strike or natural weapon, such as a bite or claw, takes 1d4 piercing damage.