Collapsing Shield

This shield grants a bonus to AC when equipped. In addition, as a move action you may deploy this shield on a single edge of your square. That edge is treated as a solid wall, granting you total cover, and creatures adjacent to you (Parallel with your wall) partial cover. You may undeploy the shield as a move action. You may not move while the shield is deployed, and changing the edge it is on is a move action that provokes attacks of opportunity.