Quad

The Quad were a type of robot invented by O-Lir and used by the Luminoth to guard Sanctuary Sector. The Quad was made up of two parts: the flying Command Module and the four-legged Main Body. In Metroid Prime 2: Echoes, these two parts of the robot are scannable as different parts. Quadraxis, the Guardian of the Ing Hive, was based on these robots. Dark Quads also exist; corrupted by the Ing. The Quad robots still serve the Luminoth, trying to destroy all others (including Samus) who try to invade the Sanctuary Fortress.