You gain the ability to divert some of your Arcane Ward's energy to manifest a shield of arcane force.  You reduce your Arcane Ward by 5 points and create an energy shield that provides +2 to your AC as if wielding a shield.  You are proficient with it and leaves your hand free.  It lasts until a long rest, you are knocked unconscious, your Arcana Ward is reduced to 0 points, or you die.  You can redivert Arcane Ward points to the shield to reactivate it.  Once 5 points have been diverted it will reactivate.  Previous conditions still apply.