The legends of your holy auracite are lies! The Stones are magicite—they hold in them power for evil.
Auracite (聖石, Seiseki?, lit. Holy Stone), also called Holy Stone and Zodiac Stone, is a form of magicite in the world of Ivalice. They are crystals, a recurring motif in the Final Fantasy series. They are magical in some way and sometimes aligned with the zodiac signs.
The Occuria created auracite from two large crystals called auraliths that contained tremendous amounts of magick, in much the same way they had created nethicite from the Sun-Cryst. The Occuria gave this auracite to Feolthanos, the leader of the aegyl, intending to use him as they had used King Raithwall. Feolthanos enraged the Occuria by refusing to serve them; instead he and the aegyl fled to the sky continent of Lemurés where he used the auraliths to create a barrier around his floating world.
Aegyl use pieces of auracite to summon Yarhi (called Espers by those from other parts of Ivalice) through a device called the Ring of Pacts. The auracite has an effect the aegyl are unaware of: creating a guardian Yarhi strips away part of the user's anima and transfers it to Feolthanos.
Thus, through thousands of years using auracite to defend themselves against unbound Yarhi, the aegyl have been reduced to little more than soulless shells while Feolthanos has grown more powerful. Feolthanos has collected so much anima that he has crystallized and become an auralith himself. While the party speculates that the sky pirates who have begun using auracite may have started to lose their anima, none of the party members from outside Lemurés seem to be affected.
So armed, these heroic souls conquered god after god, oblivious to their weapon's fatal imperfection: its propensity to bleed primal energies. And with each victory, the heroes changed, transforming at last into fiends of endless appetite. Insatiable in their hunger for aether, they ultimately went to war over the star's ever-dwindling life force...
Auracite is mentioned by Unukalhai as being involved in the fate of another world. It was used by its realm's champions to contain the power of primals, but due to a fatal flaw, it gradually bled out the energies and changed its wielders into fiends of endless appetite, devouring their world's life force.
A similar object, the White Auracite, was a pale stone that could be used to trap an Ascian, allowing them to be destroyed by striking it with sufficient amounts of aether. The Warrior of Light used these to destroy both Nabriales and Igeyorhm.
The thirteen auracites are crystals that hold the spirits of Lucavi, demons from another realm, some of which appear as Espers in Final Fantasy XII. Auracites are known as the twelve Holy Stones/Zodiac Stones of the Zodiac Braves of Ivalician legend.
The story of the Zodiac Braves is a legend highly regarded by the Church of Glabados as the central doctrine of its teachings. The twelve Zodiac Braves are said to have fought the Lucavi, driving them back into the spirit world. The legend foretells that the Braves, carrying the Zodiac Stones, would come to save humanity should they ever be in peril. In truth, the auracites facilitate the Lucavi's existence in the mortal realm via possession of those who hold their auracite.
They may not be entirely evil, as one helps revive Marach after he is shot while defending his sister. Marach claims to have heard a calm, gentle voice telling him to go back. Ramza speculates the stones are raw power shaped by the will of its wielder.
To release the Lucavi seal in the auracite, the stone needs a vessel. It is believed that the host must have the same zodiac sign of the auracite and requires that person to become the Lucavi's vessel, but this is not necessarily true; e.g. Wiegraf Folles is a Virgo, but is possessed by Belias, an Aries. In the case of the Lucavi leader, Ultima, there can only be one vessel for her auracite in so many generations.
The Aries stone is an accessory, and was attainable by defeating Belias in a Final Fantasy Tactics event. When equipped, the stone provides a +30 bonus to the wielder's Attack stat. The Aeries has Synergy with the Final Fantasy Tactics realm.
The stones are called Zodiac Stones in the original release of Final Fantasy Tactics. zodiac is a circle of twelve 30° divisions of celestial longitude that are centered upon the ecliptic: the apparent path of the Sun across the celestial sphere over the course of the year.In both astrology and historical astronomy, the
The term zodiac derives from Latin zōdiacus, which comes from the Greek ζῳδιακὸς κύκλος (zōdiakos kyklos), meaning "circle of animals", as half of the signs of the classical Greek zodiac are represented as animals (besides two mythological hybrids).