Quadraxis

Quadraxis was a huge security drone created by the Luminoth to protect the Sanctuary Fortress. However, the Ing conquered the fortress, and posessed Quadraxis, taking him to guard the Ing Hive instead. After Samus Aran landed on Aether and restored power to Torvus Bog and the Agon Wastes, she went to the Sanctuary Fortress to restore power to it as well. In turn she entered the Ing Hive and defeated Quadraxis.

Quadraxis, in its first form, uses anti-matter lasers, missiles, and a tornado attack similar to the one used by the Quad Robots also found in that sector. Quadraxis is damaged by hurting its foot joints with missiles and its foot weaponry with the Boost Ball. Once its main body is crippled its head will detach and fight on its own. The head will use a shielding device which recieves energy from the body. Using the Echo Visor, Samus must corrupt the shield transmitter on the body and attack the receivers on the head. Once one reciever is destroyed, Quadraxis will try to reastablish the lost link, and summon Dark Quad MB and CB robots in the process. Once all the recievers are destroyed, Quadraxis's final form will engage. Note that if Samus is not quick enough she, will have to use the Echo Visor again. Quadraxis's final form is defeated by using the legs as ramps, use Boost Ball to boost onto one of the two Bomb Slots on its body, and drop a bomb. Once bombs are dropped in both, Quadraxis will die, leaving Samus the the Annihilator Beam. Once she returns to U-Mos, he will give her the Light Suit, which will allow her to travel on a light shaft to the portal that will transport her to the Sky Temple Grounds.

Trivia

 * Quadraxis is one of the largest enemies in the Metroid series, easily dwarfing Samus.
 * Disassembled parts of Quadraxis can be seen scattered throughout the Fortress Temple entrance, sugessting that the Luminoth were in the process of making more than one.