The Hauberk has its genesis in Clan Goliath Scorpion's Undine BattleArmor. As Clan Diamond Shark was already known for selling Clan equipment directly to the Inner Sphere - as was the case with the Mad Cat II - the Houses practically courted the merchant Clan in the hopes they would funnel additional Clan war material their way, allowing them to better face the Word of Blake jihad.
         In the case of the Undine, the Federated Suns met the high price demanded for several of these BattleArmor, which they hoped to simply put into the field. However, the specialized use of the BattleArmor in watery terrain - a tactically limiting ability - combined with the problem of maintaining Clan technology in the field led the premier New Avalon Cavaliers to design a new assault BattleArmor in near-record time based on the Undine chassis, making the two look almost identical at first glance.

         Though exceptionally slow and lacking a jump pack, the BattleArmor mounts a potent combination of weapons; a long-range missile rack mounted above and behind the head and a right-arm mounted support laser.
         The armor itself uses an advanced version of the stealth technology developed for the Infiltrator Mk. II, making the Hauberk deadly when used in an ambush (as units such as the Cavaliers and McKinnon's Raiders demonstrated repeatedly to the Blakists).
         The physical construction of the Hauberk suits prevents them from climbing up onto a BattleMech, so they may not engage in anti-BattleMech leg or swarm attacks. For the same reason, Hauberk's cannot travel as mechanized BattleArmor with an OmniMech. Despite these limitations, the battle claw mounted as the suit's left hand can be a devastating hand-to-hand weapon against infantry.

         The Hauberk is used primarily in the region that New Avalon once ruled, though they are most known to be used by the Federated Suns Mercenary Corps.