Colossus



According to the Space Pirate data from Metroid Prime 3: Corruption the Colossus is a gigantic starship piloted by Dark Samus and governed by the Space Pirates.

Leviathan origins
Colossus was originally a Leviathan which originated from Phaaze. The malicious Dark Samus brainwashed the Pirates into building a starship for her use and personal transport, and according to data gained in the game, the Pirates built a living quarters inside the Leviathan's skull and brain. They then accomplished the armaments inside the Leviathan, and therefore began to attack the Galactic Federation. Exactly how Dark Samus obtained the Leviathan for the Pirate's usage is unclear; but she probably obtained it some time in between Metroid Prime 2: Echoes and Metroid Prime 3: Corruption.

Armament
Dark Samus was pleased with the Space Pirate's work on Colossus and she persuaded the Space Pirates to commence their war with the Galactic Federation, whose infamous bounty hunter, Samus Aran, had foiled the Pirate's missions on both Tallon IV and Aether. The Pirates armed Colossus with their leader's help, until they were ready to commence their war.

Usage during war
The Pirates used Colossus to resist Galactic Federation attacks and to control the Leviathans to guide their missions to corrupt Bryyo, Norion, Elysia, and the Pirate Homeworld. This flagship was the only Leviathan which had the code the Pirates used in order to get to Phaaze. All went well for the Pirates in the war until the infamous bounty hunter Samus Aran boarded Colossus and used the Pirate Code to allow the Federation to control the ship in order to get to Phaaze and to kill Colossus' leader, Dark Samus.