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Disclaimer: I don't own any of the characters here that belong to Metal Gear or Korra or any other work of fiction that I put into this story except for my own OCs. Neither do I own any of the character in any of the crossovers I do. I'm just using them in this fanfiction and I have no money so don't bother suing me. You'll just lose money instead of gaining any. And remember to leave a review!

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Harmonic Convergence is a supernatural phenomenon that occurs once every ten thousand years. When the planets align, spiritual energy is greatly amplified, causing the spirit portals at the North and South Poles to merge, while an aura of spirit energy envelops the Earth. During this event, Raava and Vaatu powerful spirits must engage in a battle that determines the fate of the world until the next Harmonic Convergence. However, after Raava merged with Wan, becoming the Avatar Spirit, it became the Avatar's duty to battle Vaatu in the Spirit World near the two portals that connect the two poles of the physical world.

At some point before the Harmonic Convergence of 19,829, Vaatu, the spirit of darkness and chaos, managed to break through the barriers that separated the plane of the humans and that of the spirits, allowing both entities to travel from one world to the next. However, as the Harmonic Convergence began, Raava, the spirit of light and peace, battled Vaatu and was able to restrain him for nearly ten thousand years.

9,829 BG

Battle during Harmonic Convergence

Prior to the Harmonic Convergence that occurred in 9,829 BG, the link that kept Raava and Vaatu connected was severed by Wan, who unknowingly set loose chaos into the world under the belief that releasing Vaatu would aid in maintaining spiritual balance. As a result, Vaatu was able to harness negative energy and turn several spirits dark, allowing him to gather strength while Raava weakened.

To atone for his mistakes, Wan resolved to master all four bending arts to aid Raava in the next battle, providing his body to the light spirit as a host. Though Wan initially struggled in fighting Vaatu, he was able to trap the spirit in an elemental sphere and imprison him within the Tree of Time after allowing his spirit to permanently merge with Raava, in the process creating the Avatar Spirit. To prevent humans from freeing Vaatu, Wan led the spirits from the physical world into the Spirit World and closed the two spirit portals.

171 AG

The Unalaq Crisis

Ten millennia later, Avatar Korra reopened the Southern spirit portal in an attempt to calm the dark spirits rampaging in the South. Later, she learned about the origins of the Avatar Spirit and the Harmonic Convergence from Wan while recovering from a dark spirit attack that had left her amnesiac. After regaining her memory, Korra spoke with the shaman who had aided her and discovered that the next Harmonic Convergence was only weeks away. Determined to close the Southern spirit portal, Korra set out on a flying bison from a herd that the shaman maintained during the Hundred Year War.

Together with Jinora, Korra meditated into the Spirit World, where the two eventually found themselves separated. Jinora made her way to Wan Shi Tong's Library, where she found a book detailing that if both spirit portals were open when Harmonic Convergence occurs, spirit energy would be amplified, enabling Vaatu to free himself, starting the battle between good and evil anew. Before she could relay this information to Korra, she was captured by Unalaq, Korea's uncle, who threatened the young airbender's safety to force Korra to open the Northern spirit portal.

Due to the amplification of spiritual energy during the Harmonic Convergence, the entire planet is covered by spirit lights, starting from the poles.

Korra later returned to the Spirit World via the Southern portal and attempted to close it, though the energetic increase that accompanied the start of Harmonic Convergence negated her attempts. As the portals merged, Vaatu took advantage of the subsequent amplification of spiritual energy to break free from the Tree of Time. In the ensuing battle between him and Korra, she managed the trap encase him again in an elemental trap, though before she could re-imprison him in the hollow of the tree, Unalaq stopped her and merged with Vaatu. He used the energy coming from the Northern portal during the Harmonic Convergence to permanently fuse himself with Vaatu, creating a Dark Avatar Spirit. The Avatars battled each other for supremacy, trading blows, until Vaatu managed to wrest Raava out of Korra. Separated from her host, the Light Spirit was vulnerable to the Dark Avatar's attack, ultimately being destroyed, which severed Korra's connection to the past Avatars. Unalaq subsequently transformed into a massive dark spirit and traveled to Republic City via the spirit lights and laid waste to it in his attempt to forcefully take back the mortal world.

Tenzin encouraged Korra to draw on her own spirit as she meditated within the Tree of Time, using the cosmic energy of the universe to bend her own energy rather than the elements. Korra's spirit manifested and grew to a massive size as she went to confront Unalaq. She searched the Dark Avatar's being for a sign of Raava, as dark cannot exist without light, though her efforts proved futile. The Dark Avatar seized that moment to gain the upper hand and attempt to corrupt Korra's spirit by using Unalaq's spiritual knowledge. Before he could complete his attack, Jinora's spirit intervened, bringing Raava's light back into the world by bathing the combatants in the brilliant light of the spiritual energy she had gathered, and illuminating Raava within the Dark Avatar. Korra managed to free the Light Spirit before using Unalaq's pacification technique to purify the Dark Avatar, dissipating him into a golden light. Korra, Raava, and Jinora returned to the Spirit World, where Korra and Raava used the energy of the combined spirit portal once more and recreate the Avatar Spirit, right before Harmonic Convergence ended.

After the end of the Harmonic Convergence, Korra announced that she could feel the shift in the planet's energy caused by the celestial event, noting that the world would never be the same. One of the consequences was a number of nonbending citizens across the world manifesting newly acquired airbending abilities. And causing the biggest change of all, for during the convergence and the death of the spirit of light, cause an opening to another world bringing something from that world to the world of the Avatar.

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Elsewhere -

To the east of the Earth Kingdom and west of the Fire Nation, a artificial structure appeared raising above the ocean. It's known by two names, Mother Base and Outer Heaven by those who make the structure their home. The main structure started off as a energy plant. Which the structure is like an oil platform, made to withstand the powerful storms and waves that are created on the open sea.

The plant was originally built by an American university for use as a research platform for Ocean thermal energy conversion (OTEC), with some assistance from the U.S. Government. It was also originally planned for it to link up with similar facilities if it succeeded. However, they were unable to solve the thermal efficiency problem, so the project was ultimately scrapped. Shortly thereafter, the plant fell into the hands of KBI agent Vladimir Zadornov, who was speculated to have bought the plant through a dummy company. The plant was also designed to link up with other OTEC plants, indicating an intention to expand the plant.

In November 1974, Zadornov, posing as University of Peace Professor Ramón Gálvez Mena, offered the off-shore plant to the Militaires Sans Frontières to use as a forward operating base as down payment in exchange for their services in Costa Rica. It was originally rusted and the main occupants were seagulls. However, the MSF managed to refurbish the newly-dubbed "Mother Base," eventually upgrading the design to include a hexagon-based design. Its size grew over time, fueled by captured enemy materiel, and the plant essentially became a country in itself. Their home would also come to be known as "Outer Heaven", a place for outsiders that was not governed by accepted norms.

Mother Base was nearly the target of a nuclear strike by the unmanned Peace Walker weapon, initiated by CIA Station Chief Hot Coldman. However, the plant was inadvertently saved when Zadornov betrayed Coldman and changed the target to Cuba. In addition, most of the MSF headed to Nicaragua to help their commander Big Boss thwart Coldman's plans, with Huey Emmerich remaining at the base's command tower with a skeleton crew. Huey later used the equipment in the command center to hack into the communications links of NORAD and the Pentagon, after Coldman leaked false data to the organizations.

A very brief point afterwards, a missile raid was conducted on Mother Base, which the MSF successfully thwarted. A short time later, Pacifica Ocean hijacked Metal Gear ZEKE from Mother Base's hangar, under the orders of Cipher, but was defeated by the MSF not long after. But then something happen that caused the entire structure and the people on it to disappear, leaving nothing but open ocean and a deep hole where the pillars that are buried deep into the seabed use to be. (1)

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Pre-hexagonal design

When Mother Base was first received by the MSF, it consisted of three square struts, patterned in a triangle. The top-right most strut contained a cargo elevator, two hangar areas, and a small rectangular black building. The top-left most strut contained three hangars, two miniature towers, a large white rectangular building, and a smaller, longer rectangular building. The bottom-most strut contained a heliport as well as an immense tower that also had a satellite dish on the roof.

Shortly after assembling enough manpower, and creating a Mess Hall Unit, a strut was built to the top and right of the top right strut of Mother Base, which contained two long hangars and a white rectangular building. More manpower also allowed for the development of another strut to the right of the top right most strut with it slightly being lower in position. This particular strut contained two small towers and an office building, and also had a path that had yet to be fully constructed. After hiring some more soldiers into MSF, another strut to the right of that one was built. This one contained two small towers, a large building, and a smaller building.

Hexagonal design

Eventually, because of blueprints developed by the MSF's R&D Team, Mother Base was upgraded with a hexagonal based design. Kazuhira Miller's reasoning was based on MSF's continuing growth, as the design gave it more surface area and made it easier to plan expansions to the overall plant. He also reasoned that the honeycomb design was one of the strongest, and that various militaries of that time were even thinking of using it on tank armor. However, the conversion process required a lot of GMP and recruitment to pay off, although they managed to pay it off via getting contracts from MSF's combat unit.

The first hexagonal strut was initially connected with the half-completed walkway. The second hexagonal strut's completion, however, resulted in all but the two closest struts of the old model being demolished. These two were eventually demolished later.

Mother Base in this form was also strong and sturdy enough to withstand a missile raid if the missiles weren't shot down. However, it would cause some damage nonetheless. In addition, its struts nonetheless had some weakpoints that would cause them to collapse if exploited, such as blowing them up with C4.

Mother Base contained an indoor firing range, as well as a kill house. It also possessed a weapons systems terminal and a supplies delivery catapult terminal on at least one strut in case something untold happened, or if an attack on Mother Base was inevitable (as evidenced during the Metal Gear ZEKE battle). The Mother Base also possessed a landing/takeoff runway deck similar to an aircraft carrier.

Personnel recruited by MSF were assigned to certain sections of the Mother Base. Each MSF member had individual attributes to support the group, by adding functions to the base. One of these functions was weapon development, which MSF used to upgrade weapons and create new ones.

Command Center

The command center was the proverbial brain of Mother Base's activities. It monitored the staff levels. It contained several medium office buildings, some towers, and a few paved roads. However, its most prominent structure was the tower right at the center of not only the section, but Mother Base itself, with a communications dish at the top. It also contained a solar energy plant as well as a factory that utilized smokestacks. The command center tower contained various equipment that could be used to patch into other military agencies, such as NORAD or the Pentagon, and a video monitor to view images received from MSF operations. It also had access to military satellites, which could be used to identify any locations of bases in the vicinity or whether they were above ground.

R&D Lab

This section acted as the center for research and development of various weapons, equipment, and even food. The section was equipped with two cranes (one per strut, and four counting the two on the fourth strut), at least ten circular towers, two miniature hangars, two ports, a cargo elevator on two of the struts, and a small rectangular building.

AI Lab

The lab used to develop and maintain the AI pod for Metal Gear ZEKE, as well as a place to create backups of the AI should ZEKE become damaged. It contained various wiring and a central AI device. After ZEKE was heavily damaged by Big Boss during an internal rebellion caused by a Cipher agent, Strangelove monitored the AI and analyzed the damage when Huey arrived for a checkup, to which Strangelove reported regarding ZEKE's AI possessing a backup copy.

Living Quarters

This section was where the Mother Base occupants lived. It contained at least nine towers (three small, four medium, two large, and one extra large), eight rectangular three story buildings, one rectangular one story building, eight miniature hangars, and two cranes. This was where the Mess Hall and Sick bay were located, along with their respective teams.

Sick Bay

The Sick Bay was a facility variously used to treat wounded or sick personnel,and help soldiers recover from PTSD inflicted from multiple conflicts. Amanda Valenciano Libre, the Sandinista leader, was placed here after she sustained a broken leg from an earlier battle with the Chrysalis AI weapon. When she demanded to leave, Big Boss suggested to Kaz that they let her work on Mother Base.

Hangar

The hangar was used to store and maintain any war machines that the Militaires Sans Frontieres managed to procure as well as Metal Gear ZEKE. This section was unique in that it was the only section where one of the struts was not of the hexagon design, instead being a runway strip. The hangar section also contained an "s" shaped building, and at least six towers. It also had two struts adjoining the runway strut that had what appeared to be two to three small cargo elevators, a large cargo elevator, five cranes (two on one strut, one on the other strut and two on the dock), a helicopter pad, and a dock.

Mission Support

This section was where MSF's Intel Unit operated from. It contained at least two communication arrays as well as a crane. It also contained missile turrets for use against threats identified by the operative, as well as catapults for launching supplies for troubles within the base.

Launcher systems

transport catapults

12-rocket launcher modules

anti-ship missile quad-canister launchers

surface-to-surface anti-ground guided missile launch pads

Metal Gear ZEKE hangar

This hangar was used to modify and improve Metal Gear ZEKE. It was about four stories tall with a movable platform containing ZEKE, as well as possessing lockers and some supercomputers. It also had some hooks, which are presumably used to lower and raise several parts onto ZEKE or from ZEKE. It also had at least two blast doors that ZEKE could enter or exit from.

Training facility

The Militaires Sans Frontières' training facility was used to train personnel in firearms and urban combat. It consisted of four stories, and was split into two sections: the firing range and the kill house.

Mother Base's shooting range.

The firing range had some supercomputers near a flight of stairs, as well as some catwalks. Some crates and cylindrical containers are also located near the exit. It also possessed four booths allowing for one member each. There were also three types of pop-up targets that were used in the training sessions: regular targets, surrendering targets (they are identified by their hands in the air and are advised to not be shot at), and unidentified targets resembling squares in the air. Some of these targets also moved. Aside from firearms, the MSF could also train with throwing weapons in the area with the exception of supply markers and strike markers.

Mother Base's Kill House.

The kill house had several structures that resembled a maze, and any MSF members partaking in the training session had to go through each section to knock down each target before moving on to the next one, with some requiring the use of the second story catwalk. Normally, the training facility had a time limit for these sessions (three minutes for the firing range, and five minutes and 24 targets for the kill house), but Miller sometimes gave unlimited time (and in the case of the kill house, unlimited targets as well) as a special treat to the MSF personnel.

Brig

The brig was a facility used variously to house prisoners of war, enemy combatants, or those whose freedom was deemed a security risk to Mother Base. The brig was where captured enemies were confined until hostilities ceased, such as KGB agent Vladimir Zadornov, due to his involvement in the Peace Walker Project and his previous attempt to kill Big Boss. In addition, most of the time, the captured enemies, upon the hostilities ceasing, would also join MSF. One of the cells was damaged during one of Zadornov's escape attempts when he cut a hole through the cell with his prosthetic hand. He managed to escape confinement on several other occasions after his prosthesis was confiscated, due to Pacifica Ocean's interference. Those sent in were usually commandos or tank commanders and escorts.

Deck

The deck, also referred to as the Metal Gear ZEKE deck, is an area located between the Command Center and the Mission Support sections. It was named as such due to the cargo elevator that led to ZEKE's hangar, as evidenced by the cargo elevator that ZEKE exited from after Paz hijacked it. Helicopters were often launched from and stationed here to deliver supplies to operatives in locations out of range of the supply catapults on the Mission Support section. It also possessed computer consoles used to operate the supply catapults and various weaponry on the Mission Support section, in the event that an attack or unexpected event occurred on the deck.

Sauna

The sauna, or shower rooms, were a location that had been installed sometime during the Peace Walker Incident. Big Boss initially approved of it, but eventually decided against it during a mission, due to it being extravagant and costly. Miller reasoned that its installation would be economical by filtering the sea water, and cutting down on electricity costs, in addition to boosting morale among the base's Finnish personnel. It generated steam after the room was heated, similar to Finnish saunas. The sauna became the site of a brawl between Big Boss and Miller, after the latter was confronted by the former over his womanizing behavior, which disrupted morale on the base and caused one of their soldiers to be hospitalized for a month.

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Placing the damage report down Big Boss like everyone one else on the base wondered what had happen. They were repairing the damage and resupplying the base when strange lights surrounded the base causing all the electronics to go haywire. The light disappeared as fast as it came leaving everyone in the dark of what happen.

"How are the other struts?" Big Boss ask over the radio.

"No damage from whatever was that," Kazura Miller said on the radio.

"All clear," Amanda said.

"All clear," Huey said.

"No damage," Chico said.

"It's fine here," Dr. Strangelove said.

"Nothing to report," Cécile said.

Once he got an all clear from all the different sections of the base, Big Boss gave out the all clear signal to tell the soldiers on base to stand down.

"We are getting strange radio signals and stations from places I don't recognize," Chico said on the radio.

"On the radio we're getting news about a Republic City and no tv stations at all," Miller said.

"Send out one of the fishing boats to find out what's happening on the mainland," Big Boss said.

The small fleet of 4 fishing boats are to get supplies from the mainland and help feed the base. Also transport for emergencies.

"On it," Miller said wanting to find out what's going on.

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Author's Notes -

1 - I can't understand the story at all with Metal Gear and the games that take place before the first game make it even worst. As all the stuff that happens in Metal Gear 3 at least struck with the plot of what happen. But afterwards with a teleport machine made in the 1970's and never shows up in any other game, just make it too confusing and doesn't make sense what so ever.

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