Quadraxis

Quadraxis is a giant robot and a boss in Metroid Prime 2; Echoes.

Appearance
Quadraxis is giant spider-like Robot, with four legs, and a giant brain inside it's head.

Metroid Prime 2: Echoes
Quadraxis is one of the guardians for the Emperor Ing. It's a three phase boss fight that test most, if not all of Samus' skills, while at the same time dealing with the toxic atomphere.

Phase 1
In the 1st Phase, Samus has to shoot at all four of Quadraxis' legs while avoiding it's spin attack, machine guns, and other attacks. After all four of it's legs are destroyed, it's body collapses to the groud, but it's head disconnects itself from the body and kills to kill Samus.

Phase 2
On the Second Phase, Quadraxis' head tries to kill Samus, so Samus has to the Echo Visor to sever all the Connection between Quadraxis' body and Head. When the link is destroyed, Quadraxis will try to re-connect the links. It will also summon Dark Quad Robots to defend itself. When all the connections are destroyed, Quadraxis somehow is still active, which begins the third and final Phase.

3rd & Final Phase
In this final phase, Samus must attack Quadraxis until it's stunned. When It's stunned, Samus morphes into a ball and uses Spider-Ball Track to jump onto Quadraxis. Samus then processes by bombing the head twice at very specific areas. After that areas are destoryed, Quadraxis is finally destroyed and granting Samus, the Annihilator Beam.