Terms from the Mega Man Legends series.


Carbon, known as Decoy (デコイ) in Japan, is how the persons that are part of the System refer to the artificially created humans that live on Terra (Earth). They are also referred to as Betas by the Master of Elysium. Unlike the original humans from Elysium (Heaven), they suffer from thirst, hunger, disease and in the end age and die, and because they know these hardships, they also know the meaning of happiness. Like normal humans, they are organic beings made of flesh, but are able to replace their regular body parts by mechanical implants, ranging from simple arm replacements to full-body overhauls.[1][2]

Carbon Reinitialization Program

The Carbon Reinitialization Program, known (roughly) as "Humanity Regeneration Program" (人類再生プログラム) in Japan, is a program of the Master System that was meant to run only after all original humans from Elysium have died, using their genetic code from Elysium's Library to clone new humans and "delete" all Carbons (humans) in Terra, restoring the ancients.

In Mega Man Legends 2, the Carbon Reinitialization Program of Elysium could only be accessed by putting the four keys in their right places for the door to the Mother Zone Library, which contains the genetic records of the humans who built the System. Yuna had hidden the keys so Sera could not start the program, but Geetz convinced Von Bluecher and Mega Man to search for the keys, saying they are needed to unlock the Mother Lode and have access to technology that has long been lost. It was the Master's last wish to delete all data from the Library and destroy the Master System. In the end of Mega Man Legends 2, the Carbon Reinitialization Program slowly started shutting down as well as the Master System.

In Mega Man Legends, MegaMan Juno attempted to use a reinitialization program similar to the Carbon Reinitialization Program, but that would only delete the Carbons on Kattelox Island instead of the planet, avoiding overpopulation. In the non-canon crossover Namco × Capcom, Juno was revived and became a "Aberrant Unit" that tries to reinitialize all Carbons in the planet with Eden.


Digger, known as Digouter (ディグアウター) in Japan, is the name given to people that excavate ruins protected by Reaverbots to gather ancient technology and Quantum Refractors. Among them, there is a rumor of a treasure known as "Mother Lode", which is said to be so valuable that could make the wearer rich. Diggers may search ruins to help people by finding ancient technology or only to find valuable treasures. Some Diggers have partners known as Spotters (Operators in Japan) that help them from outside. For instance, MegaMan Volnutt & Barrett are Diggers and Roll Caskett & Aero are Spotters. There is also a guild of Diggers, the headquarters of the Digger's Guild being located in Nino Island.

Quantum Refractors

Main article: Quantum Refractor

Quantum Refractors, known as Deflector in Japan, are the main energy source in the Mega Man Legends series. They are used by both Reaverbots and the people on the surface. Refractor shards are collected and used as Zenny.

Mother Lode

Mother Lode, known as Great Inheritance (大いなる遺産 Ooinaru Isan) in Japan, is a legend between Diggers rumored to be a valuable treasure that could provide so much power that the world never need to fear of running out of energy and make the wearer rich. However, it is revealed in Mega Man Legends 2 that the Mother Lode is believed to be located on Forbidden Island. It is also revealed that it is not a treasure, but "a catastrophe" as said by Yuna (inside Matilda), the Carbon Reinitialization Program, and how Mistress Sera was about to use it.

Mother Lode keys


The Mother Lode keys in the Mother Zone

The four Mother Lode keys are required to activate the Carbon Reintilization Program in Elysium. They have the power to turn on or off the program and yet to open up the area where the program is. The Mother Lode keys are very resistant, shown to be able to resist lava.


Ruins are countless underground labyrinths and caverns located in many parts of Terra, that are inhabited by Reaverbots and contain various treasures and artifacts. Diggers, those that dare to explore the Ruins, go to them to "excavate" the items contained inside.

It is revealed in Megaman Legends 2 that the Ruins are the scattered remnants of the Elder System, that carry a potential threat to the world.


The System (システム), also referred as the Master System, is the system of Elysium. Not much was revealed about the System, except its main function is to protect and serve humans that live on Elysium, the Master being the only known. Despite this system allowing them to live in peace without conflict, it allows the euthanasiasion of Carbons on Terra (to prevent overpopulation) and strictly coheres to its rules without remorse.

In the end of Mega Man Legends 2, Mega Man destroyed the System. A previous version, known as the "Elder System" ("World System" in Japan), that was shut down by the humans of the Master System, has started to reactivate.

System's units

The function of the units of the System is to serve and protect the humans from Elysium and follow the Master System. In the far past known of the Mega Man Legends timeline, the Master is the only remaining human, and not many units are seen.

Mother Unit

Mother Unit is a android with positronic brain built to watch over and manage a world, as said by Yuna near the end of Mega Man Legends 2. Sera and Yuna are the only Mother Units, with Sera assigned to the systems of Elysium while Yuna is to the systems of Terra. Yuna also mentions she has nanotechnology on her body, which could explain why Sera, Gatz and Geetz are able to change their form and, in the case of the Servitor Units, assimilate machines like the Sulphur-Bottom.

Servitor Unit

Servitor Unit is a class of android that serves a Mother Unit. In Mega Man Legends 2 there are two Servitor Units. Geetz is the Servitor Unit for Mistress Sera and Gatz is the the Servitor Unit for Mistress Yuna. Both Servitor Units have the ability to transform into large dragon-like Reaverbots.

Purifier Unit

Purifier Unit, known in Japan as Irregular Hunter (the same Japanese name for Maverick Hunter), is a first class model from Elysium that has the function to seek out and eliminate "Aberrant Units". MegaMan Trigger is the only known Purifier Model, being a "First Class Purge Officer". Mega Man Trigger was "reset" to a child form after the fight against Sera.

Bureaucratic Unit

Bureaucratic Unit is a third class model from Elysium, MegaMan Juno being the only one known. In Japan, he is known as a Third Class Purging Officer (三等死生観, Santoushiseikan), with MegaMan Volnutt being a first class unit. His function is to control the carbon population in Kattelox Island. When he awakened in the first game and saw the population was far above the limit, he decided it would be easier to "Reinitialize" the island.

Aberrant Unit

Aberrant Units, known as Irregulars (the same Japanese name for Maverick) in Japan, are units that malfunctioned and threatened the Master System. Purifier Units are in charge to eliminate those units.


  1. Mega Man Legends 3 Devroom: Kinako's Daily Report #72
  2. The Reploid Research Lavatory: Dr. Data’s DASH Dissertation
Community content is available under CC-BY-SA unless otherwise noted.