Little if anything is known about the origins of the Starscourge, a situation made more confusing by different inferred origins in various localizations of the game. It appeared at some point in the distant past of
Eos; in the German localization,
Ardyn Izunia says Starscourge originated from the
Meteor of the Six,
[1] but it is not stated outright in other versions. The Starscourge plague emerged 2000 years prior to the events of
Final Fantasy XV, and was subdued through the efforts of a Chosen King, aided by the
Astral Bahamut, and the planet's gift of the magical
Crystal, whose light destroys the Starscourge and those it infects.
[2]
The Crystal exudes great magical power, and is said to hold the soul of the world. Bahamut put his plan to purge Starscourge into motion by handpicking two people, one whose bloodline would become the Crystal's protectors, and the other the first Oracle. The Oracle has the power to counteract the Starscourge and hold it at bay, and her bloodline became the
royalty of
Tenebrae. The bloodline that protects the Crystal became the
Lucian kings, who are granted power to combat daemons and be empowered by the Crystal. The Astrals' last gift before they fell into a deep sleep was the
Ring of Lucii, which would house the souls of the Lucian kings. The Starscourge subsided by the king's hand,
[2]and the
Final Fantasy XV Scenario Ultimania posits the power of the
royal arms, combined with the power of the Crystal, can destroy the Starscourge.
[3] Legends tell of the king of Lucis forging covenants with the Astrals two millennia ago, and fighting alongside them against the darkness. The scourge did not disappear from the world entirely however, and it was feared it would once again overwhelm Eos one day.
The Lucian royalty can combine their powers across generations via the bonding of the souls, as the one who wears the Ring of the Lucii can wield the powers of the kings of old. Thus, the power of the Crystal gradually concentrates until the king who wields all of the Crystal's power will be crowned the
True King who can purge the Starscourge at the cost of his own life. This became the
prophecy: "When darkness veils the world, the King of Light shall come." With the plan to cleanse the world of Starscourge in motion, Bahamut disappeared from Eos, and the tales of the Astrals became legends.
It appears the Oracle's healing people of the Starscourge is to also buy time for the Lucian lineage to accumulate enough power for the True King to appear. He is said to be even more powerful than the gods and to have the power to banish the darkness from the world. The Lucian kings are sworn to protect the Crystal until that day arrives, and gain the ability to use various magical powers as facilitated by the Crystal. The
Final Fantasy XV Scenario Ultimania describes the Crystal as having immense magical power, but that the kings of Lucis don't wield its full potential; rather, they have the responsibility of protecting it. The Crystal picks the "Chosen King" when disaster comes to the world.
[3]
During the initial scourge 2000 years ago,
Ardyn Lucis Caelum was a member of the Lucian kings' bloodline who was chosen by the Crystal to save Eos from the Starscourge. He absorbed countless daemons into his own body, which saved thousands across the world, but resulted in him being rejected by the Crystal and denounced by his successor, and subsequently the Astrals, as unclean. Denied his ascension to the throne, he was demonized—and possibly killed—by a jealous future king who later became chosen by the Crystal in his stead.
[3] As his transition rendered him immortal, Ardyn became the embodiment of daemonic influence in the world and the Starscourge. He took the surname of "Izunia" and vowed to one day have his revenge on the Caelum dynasty and the Crystal.
Two thousand years ago the world was in turmoil due to the spread of Starscourge, the
Great War of Old between the Astrals and the fall of
Solheim civilization. Starscourge is said to have been abated by a Chosen King two thousand years ago, Ardyn's replacement. Thus Ardyn was cast aside and forgotten as a new era of peace began.
Ardyn bided his time for millennia before establishing himself as chancellor to
Iedolas Aldercapt, the emperor of
Niflheim. He provided his knowledge to begin his plan for revenge. With Ardyn's coaxing the empire began to use daemons for experiments for creating a
magitek infantry, and to deploy as weapons of war. A mysterious "vanishing disease" began to ravage the imperial lands. In his scheme to exact vengeance upon the Lucis Caelum line and the Astrals, Ardyn revived the Astral god
Ifrit with the Starscourge. The Japanese and German versions of the
bestiary posit that this corrupted the Astral's mind and body.
Although the Starscourge is not a new phenomenon, it was poorly understood. For a time the vanishing phenomenon that has people disappear into thin air was not considered to be a disease. In truth, the people who become afflicted with Starscourge disappear when they fully turn into miasma and become daemons.
After Ardyn murders Lunafreya, the effects of the Starscourge accelerate. With no heirs, the Oracles' bloodline is extinguished when both Lunafreya and
Ravus Nox Fleuret are killed. Ardyn lures
Prince Noctis, the last of the Lucian lineage, to
Gralea, the capital of Niflheim, where the Crystal is now kept. The Crystal had always kept the Crown City of
Insomnia safe from daemons, and Noctis believes he can save the world if he can salvage it. As Noctis touches the Crystal with the Ring of the Lucii however, he is pulled inside it. In an otherworldly dimension that exists on the inside of the Crystal, Noctis meets Bahamut who explains to him that he is the True King.
After Noctis disappears, the world is overtaken by darkness. Over the following decade, the Starscourge overwhelms Eos, covering the world in an eternal night and plaguing it with daemons. After Noctis awakens ten years later, he returns to the ruins of Insomnia with his friends to stop Ardyn and end the Starscourge. Ardyn pits Noctis against Ifrit, but Noctis defeats him with the help from the other Astrals before encountering Ardyn in the
Citadel's throne room.
Overpowered by Noctis, Ardyn is finally able to rest in peace. His body fades away, and his spirit is destroyed when Noctis—who gave his life to halt the Starscourge and purge the daemons—uses the power of those he cherishes and the Lucian kings of old to land a final blow. As Ardyn's soul is erased, the darkness is lifted, daemons disappear and the sun rises. The prophecy fulfilled, the Ring of the Lucii disintegrates as the Lucian bloodline ends with Noctis's death.