The Adv. Brigandine shield is a positron based shield that protects the player from Tachyon and Neutron based weapons. It is the shield that has the most hitpoints. Therefore, it is the best shield in the game. However, it does not protect the player from all weapon types just as well as it does for Tachyon and Neutron weapons. Laser, Photon, and Pulse weapons will disable it faster than any other weapon type.