Barrier Tool

Created by magical tinkerers, this magical tool is attached to and merges with a shield, allowing the user to create a physical barrier with the shield. The tool has spikes at the bottom that automatically thrust out and insert themselves into the ground when the user slams the shield down into the ground. The user need only pull up with the intent to remove the shield from the ground and it releases, leaving no trace that the barrier had ever been there. It can bond with two other shields, one on either side, forming a small barrier that allows for the creation of half cover. 

The barrier can be wrenched forcibly from the ground by a DC 24 Athletics check.