Ragnarok

Ragnarok (ラグナロク) is a satellite cannon from Mega Man Zero 4 that Dr. Weil developed, created for the sole purpose of destroying Area Zero.

Specifications

 * Model number: RF-SX12
 * Height: 72.4m (conventional)
 * Width: 231m
 * Maximum range: 900-1800km
 * Maximum output: 30Mw
 * Main armament: One particle energy cannon, eight free electron lasers, and two accelerators modules.

Characteristics
From orbital view, Ragnarok is not only a massive satellite cannon, but in fact one the most advanced and largest space station at the time. It resembles Eurasia at some point, both having top-like structure. At the top of the structure is the control room which has a green observer, also function as the control module the cannon. On the eight directions spreading from the top are eight supportive free laser electron cannons red-steel modules which mounted onto the station as reinforcement plates.

The cannon has total of three modules: The main cannon which consists 1/3 mass of the whole station, features lots of energy-supplying pipes on top and a round energy booster combine with aiming structure at near end. Two accelerator and aiming modules are symmetrically placed down after can regulate the whole module and fires refractive beams that connects and boost the main cannon's plasma beam energy even further, only takes up two minutes before completely fires off at 100% power supply, which creates large a massive plasma energy ball at the beam joints.

Ragnarok features heavy outside security with a strong protection layer of energy and distortion waves, which guarantees no spaceship could come close and docking in, but however has intensive support for transfer system from earth to the inner structure, capable of transfer a whole battalion at the same time. Ragnarok is protected only for Weil to transfer unless hacking attempts were made, for an only good reason: The control system is at the top which can fires off and decimates a small city in a blast.

The inner structure is rather complex and straight upwards, from the core module to the control room. It has relatively simple backgrounds, mainly red-yellow-green with many hazards such as holes and spikes, hanging elevator structures and many bizarre energy pulses from background. On the core room, many docking and glass windows can be seen from inside. The real core which hosts itself in the room, is rather small however, comparable to a Mutos Reploid's height, shaped like a giant sword with yellow lines run across a white colored mechanism around a purple-ish inner core..

History
On December 16, Craft used Ragnarok in an attempt to kill Weil in Neo Arcadia, destroying the tower Weil was in and causing over 20,000,000 casualties. Craft also had Ragnarok charge up for a second attack, although he aborted it when he fought Zero.

After Craft's death, it's shown that Weil survived. He alerts Ragnarok's activity by firing a shot again, and attempts to use Ragnarok again, this time by crashing the satellite into Area Zero to destroy it. However, this attempt was sabotaged by Zero when he confronted Dr. Weil. The madman fused with the station's core to battle Zero, but Zero manages to defeat him, destroying the station in the process. Zero perishes/disappears in the explosion, thus ending the Mega Man Zero series.

Ragnarok as well as Weil serve as the main 'enemy' as Biometal Model W in Mega Man ZX and its sequel, Mega Man ZX Advent. In the latter, all of the remaining fragments of Model W merge together to create Ouroboros, which bears a striking resemblance to Ragnarok.

Structure
Zero makes two trips to the Ragnarok. First, he teleports straight to the station to charge the control room and stop Craft's attack. The second time, he is forced to break in through the Teleporter Base, and even disable the security in the Teleporter Circuit before storming the Core.

Ragnarok Control
It is the first contact Zero had with Ragnarok. The place has many spike hazards, with reinforced steel background and the surface color is mainly green. There are also many hanging elevators and holes, which are reasonable since this place is the lowest point player can reach of Ragnarok. The higher the stage set, the more background will be uncovered, leaving red energy lines on the walls and more spikes will appears also. The only boss player will encounter here is Craft.

Ragnarok Core
The highest habitable point, also the central of all the activities of Ragnarok. It is rather close to space and lesser hazards compared to control room, which the higher layer has many docks and glass windows which can be seen from inside, even Earth partly. The ground layer is covered by a golden wall with many steel points, and the surface is mainly orange colored. The core room is the host for many resurrected boss fights:
 * Highest: Pegasolta Eclair and Sol Titanion
 * Higher: Fenri Lunaedge and Noble Mandrago
 * Lower: Popla Cocapetri and Tech Kraken
 * Lowest: Heat Genblem and Mino Magnus

Etymology
Ragnarok is foretold battle and event in Norse Mythology where the Norse pantheon will end up killed, and the world undergoes several cataclysmic events before sinking underwater and reborn anew, a name rather fitting for a satellite designed to destroy large areas from orbit.

Trivia

 * Ragnarok is one of the rare final boss rooms in from Zero series onwards to host all eight bosses at once.
 * Ragnarok sticks with the theme to features a colony station that docking out of earth's reach in the whole timeline series, followed Eurasia and later Ouroboros.