Z-8250 Anti-Ship Exterior Defense Network

The Forerunner Anti-Air Turret is an automated Forerunner directed energy weapon used on Requiem and the Mantle's Approach.

Function
This weapon is designed to defend structures or ships against enemy aircraft. They can be seen in various locations around the planet Requiem including the loctaions known as Control, Lockup, and The Gate. Both the Covenant and the UNSC made use of these weapons during the Second Battle of Requiem. The Didact's personal ship the Mantle's Approach is also equipped with a large amount of these turrets that serve as a point defense system. John-117 had to  manauver past dozens of these turrets in a Broadsword Fighter in order to reach the inside of the Mantle's Approach.

Design
The weapon consists of a three pronged shape which (from above) resembles the Marathon logo. It also has a smaller teardrop-shaped device floating above the main body of the weapon. The weapon fires what appears to be explosive rounds of Hard light that can either detonate on impact with a target or detonate in the air after a certain amount of time in a similar manner to flak cannons.