|War of Transgression|
|Final Fantasy XIII|
|The Pompa Sancta parade in Nautilus Park, depicting the events of the War of Transgression.|
|Pulse fal'Cie||Sanctum fal'Cie, most notably Barthandelus|
|Pulse l'Cie||Sanctum l'Cie|
|Unknown, likely heavy.||Unknown, likely heavy.|
- See also: Datalog/History and Myth.
Several hundred years ago, the armies of Pulse attempted to invade Cocoon in a conflict known today as the War of Transgression. The Sanctum's fal'Cie were able to repel the lowerworld forces before they breached Cocoon's interior, but not before they managed to seriously damage areas lying near the world's outer rim.
Details surrounding the clash remain shrouded in mystery, but the government's swift and decisive response to this violent Pulsian transgression minimized casualties and greatly boosted public faith in both the Sanctum and their fal'Cie.
It was thought by the inhabitants of Gran Pulse that Cocoon was created by the fal'Cie Lindzei, the Maker of the Cocoon fal'Cie. People from Gran Pulse were lured to Cocoon with sweet promises of paradise, giving those who remain on Gran Pulse the false idea that Cocoon was the source of all evil that must be destroyed. Similarly, the inhabitants of Cocoon were made to believe that Gran Pulse was a primal, hellish world filled with unknown terrors and monsters.
Two Pulse l'Cie from the northern village of Oerba were chosen to destroy Cocoon: Oerba Yun Fang and Oerba Dia Vanille. Their Focus was to transform into a being known as Ragnarok and destroy Orphan, the source of all power in Cocoon. Due to Vanille's fear of the beast's power, she ran off and left Fang to carry out the task on her own. Fang's incomplete Ragnarok managed to crack Cocoon's outer shell before the goddess Etro, knowing that Cocoon's destruction and the resulting deaths would disrupt the natural order, transforms both Fang and Vanille into crystals to foil the fal'Cie's intent to force Etro's Gate to open.
Cocoon suffered considerable damage during the war, its shell was cracked open by Ragnarok and the Sanctum fal'Cie had to salvage components from Pulse in an attempt to mend it. The War of Transgression also signaled a widespread fear of Pulse among the citizens of Cocoon, which lasted even during the events of Final Fantasy XIII.
Pulse meanwhile, did not fare as well as Cocoon. Almost the entire human population of Pulse was mostly wiped out with those who survived being outnumbered by the monsters patrolling the underworld. Exactly how this happened is unknown, but it was likely a combination of many things. The Cie'th Stone's mention of Pulse fal'Cie turning people into l'Cie with vague Foci, and many Pulse city ruins are swarming with Cie'th. Anima is also mentioned of having been the protector of Oerba, but after the war, the Pulse Vestige containing Anima and Vanille and Fang's crystal forms was taken into Cocoon, leaving Oerba defenseless.
- In Final Fantasy XIII-2, it is mentioned that records were found in an Oracle Drive that described this conflict.