F.L.E.I.J.A.

The Field Limitary Effective Implosion Armament (F.L.E.I.J.A.) is a "Heavy Strategic Anti-strongpoint Neutralize Warhead" developed by In Vogue under the leadership of Nina Einstein. Nina Einstein was also able to develop a countermeasure for the F.L.E.I.J.A. known as the F.L.E.I.J.A. Eliminator.

Background
Initially under development in Ashford Academy by Nina Einstein, it began as Nina's personal research on the possibility of using as a viable source of fuel. Lloyd Asplund later took an interest and provided her with Sakuradite to further her research. Following Princess Euphemia's death, she created a makeshift nuclear reactor fortified with Sakuradite. She then affixed this reactor to the antique Ganymede housed within the academy, intending to detonate it and take out all of Tokyo in a misguided attempt to kill Zero and avenge Euphemia. However, it failed to explode and was quickly seized by the Britannian Military.

After being recruited as the chief of the In Vogue development team, she continued her research into nuclear power; however, the earlier prototypes she made all failed to achieve her desired result. She eventually created her first working prototype, dubbing it F.L.E.I.J.A. In preparation for the Second Battle of Tokyo, she mounted the first one on the Lancelot Conquista, with a specially made gun for the warhead. Suzaku Kururugi, influenced by Lelouch's Geass, then detonated the prototype in the middle of the Tokyo Settlement, killing over 35 million people.

A month afterward, the Toromo Agency in Cambodia managed to mass-produce them and mounted them all on Prince Schneizel's secret weapon, the Sky Fortress Damocles. After Lelouch took over the Britannian throne and Suzaku quelled the Knights of the Round Uprising, Schneizel made his move, firing a F.L.E.I.J.A. of his own from Damocles to destroy the Britannian capital, Pendragon, thus paralyzing the Britannian government. Unlike the first F.L.E.I.J.A, however, this unit had its limiter removed, multiplying its destructive radius by 10, and leaving only an empty crater where the Britannian capital once stood. As explained to his sister Cornelia, Schneizel's ultimate plan was to use F.L.E.I.J.A. to devastate the world, killing up to, according to his estimate, 1-2 billion people, in order to cow the human race into recognizing his authority, thus bringing permanent peace to the world.

During the Battle of Mt. Fuji, the Damocles and its F.L.E.I.J.As are brought onto the battlefield to aid the Black Knights. After their forces are initially devastated by the Sakuradite eruption from Mt. Fuji triggered by Lelouch, Schneizel begins employing the F.L.E.I.J.As, with several being unleashed during the battle. At one point, as Lelouch and Suzaku fly towards the Damocles, he orders one fired directly on them to wipe them out. Instead, the two work together to defuse it using Nina's new F.L.E.I.J.A. Eliminator, and breach the Damocles. In response, Schneizel sets a new F.L.E.I.J.A. to detonate within the Fortress, which would consume it and Lelouch in one stroke. Preparing his escape, Schneizel intended to rebuild F.L.E.I.J.A. using the support he'd gain from destroying Lelouch. However, Lelouch anticipates this and apprehends Schneizel. After this, Lelouch seizes control of the Damocles, and therefore gains control of the F.L.E.I.J.As within, using the weapon to assert control over the world.

Following the completion of the Zero Requiem, the Damocles, and presumably the F.L.E.I.J.As it stored, were disposed of by being sent off into outer space and flown into the sun.

Properties
It is a bomb of an unknown type, developed using Sakuradite to cause a tremendous collapse effect obliterating all matter within its area of effect. When it detonates, the warhead's blast takes the form of a blinding, spherical flash of light. The light is pink in color, most likely due to the Sakuradite the weapon contains. It has the destructive power of fifty mega-collapse effects and is reinforced with Sakuradite by twenty units. Its range is at least 3,000 meters within a cylindrical zone, preceded by a 1,300-meter radius spherical zone, and a tertiary range of 5,000 to 8,000 meters. The succeeding bombs created by the Toromo Institute, however, removed Nina's limiter, giving it a blast radius of 100 kilometers.

The only known tool that has stopped a F.L.E.I.J.A. is the F.L.E.I.J.A. Eliminator. The Eliminator strikes the warhead with a reaction specially adapted as an equivalent to its own in order to neutralize the weapon in mid-detonation. During the Battle of Mt. Fuji, when the first F.L.E.I.J.A. was fired from Damocles, a Britannian team of Vincent Commander Models attempted to stop the warhead from detonating by skewering it with their MVSs, but this failed. According to Schneizel, this failed due to the warhead achieving criticality as soon as it was launched, suggesting that it may be possible to sabotage the F.L.E.I.J.A. mid-flight prior to detonation.

Sequence
Sakuradite within the F.L.E.I.J.A. is detonated in mid-air. The immediate energy caused by the sakuradite explosion then causes a nuclear fission reaction. The collapse effect starts at the creation of a Folkvangr Field. The collapse effect known as the Sessrumnir Sphere expands until it reaches its set range capacity. The Sessrumnir Sphere then rapidly reduces until it vanishes, along with everything caught inside the sphere. Air rushes to fill the space that the sphere (along with all matter absorbed into it) once occupied. This effect also damages nearby units and vehicles.
 * 1) Sakuradite Explosion
 * 1) Nuclear Fission
 * 1) Folkvangr Field Creation
 * 1) Sessrumnir Sphere Expansion
 * 1) Sessrumnir Sphere Reduction and Vanished (Space Transfer)

Trivia

 * The name F.L.E.I.J.A. is a reference to the Norse goddess of love and magic,, in Nordic mythology. Furthermore, the name "Sessrumnir" and "Folkvangr" were also based on two places where the goddess rules. Folkvangr is a field where slain warriors would go after their death and is ruled by Freyja. Sessrumnir, meanwhile, is the hall where the goddess resides.


 * The F.L.E.I.J.A. is an obvious reference to the atomic bomb, which Albert Einstein helped to create, whilst Nina Einstein created the F.L.E.I.J.A.


 * The human damage caused by F.L.E.I.J.A. on the Tokyo settlement (10 million civilians killed and 15 other million wounded) are similar to those (between 11 and 13.6 million dead and 10.3 to 14.6 million wounded) that could actually be caused by Tsar Bomba (the most powerful nuclear weapon existing) if it were to be dropped on the real city of Tokyo, according to the website Nukemap.