The thing is that nothing in the RP should be absolute, even if it makes sense nothing can be unbeatable or one-hundred percent immune to something. Just like you yourself said, it's hypocritical. For the sake of the RP being fair an AM field cannot be unbeatable when it comes to magic, it should be able to be overwhelmed.
Nilgaitt infused Quasar - After the recent attack on the Library's Quasar the Archive has increased it's defenses, by employing the relinked Noverians and an incredible amount of Nilgaitt the Archive has infused the Quasar with Nilgaitt, effectively rendering it very magic resistant.
QPRD, Quick Portal Redirecting Defense - The QPRD is a new defensive technology created by the Archive, effectively rendering most projectile weapons useless or ineffective against Archive vessels, fortresses, and planets. Controlled by a hub of super-intelligent VIs the QRPD creates wormholes that redirect projectile weapons back towards their origin. FAL weaponry have been known to be more effective although not entirely, as the QRPD is equipped with sensors that can detect energy charges.
SIGURD Fortress Defensive System - The Sigurd is currently the leading Archive armor system, by incorporating all the leading defensive technology into one system the Archive has created a nigh-indestructible system. Treated Neutronium, EMP resistant materials, BALAR, Nilgaitt, Gray Matter, QRPD, Aegis Shielding, ETC. Currently it's only been equipped into the Library, as it's very, very expensive.