The Wall

The Wall is a massive 400 foot high barrier which surrounds The Apex 360 degrees, and is powered by 3 Generator Towers which project a Light Shield in a transparent dome around The Apex, which is 10,000 feet from the main apex tower and projects the shield 10,000 feet into the air in a perfect transparent semi-sphere, it's invisibility is demonstrated when a Grendel controlled ship crashes into the shield.

Battle of Haven
The MSWG played a major part in the Battle of Haven. This Wall was involved. Davian, leading the MSWG, lead a charge to disable the 3 Towers. They successfully disabled them, only for Adrean's Sloop to fly through to The Apex.