Aidios has had loyal followers ever since she bestowed the seven celestial treasures known as the Sept-Terrion on humanity, which was prior to both the Great Collapse and the founding of the Septian Church as an institutionalised religion.
Aidios charged the Holy Beasts with protecting the Sept-Terrions and with watching over and protecting humanity. However, Aidios made the Holy Beasts take an oath to not directly interfere with Humanity's conflicts until the "Appointed Time". As such, Holy Beasts like Ragnard were unable to assist Humanity until the Sept-Terrion they guarded was taken by someone else or the Sept-Terrion itself vanished from the world altogether.
Worship of Aidios is still relatively new in Erebonia, which for many years practiced Animism. Worship of Aidios does not necessarily conflict with animism and, in some cases, animistic practices have been incorporated into the teachings of the Septian Church.
- Aidios in Ancient Greek translates to form, essence, type, species
- Aidios is similar to the Spanish phrase "¡Ay Dios!", which translates to "Oh my God!"
- The English version of Trails in the Sky FC changed "Eidos" to "Aidios" due to copyright issues since "Eidos" is the name of another video game company
|Congregation for the Sacraments|
|Dominion||Ein Selnate (1st) - Thomas Lysander (2nd) - Celis Ortesia (4th) - Kevin Graham (5th) - Gunther Barkhorn (formerly 8th) - Gaius Worzel (8th) - Wazy Hemisphere (9th) - Rion Balthazar (11th)|
|Knight||Rufina Argent - Abbas|
|Squire||Ries Argent - Rosine - Scarlet - Wald Wales|
|Congregation for Divine Worship|
|(Arch)Bishops||Amon - Currant - Eralda|
|Fathers||Divine - Holstein - Oswald - Oswell - Reval - Theodore - Vixen|
|Sisters||Frieda - Kiera - May - Noah - Rosa - Tatiana|
|Papal Guard||Iscariot (Ashrad)|
|Cathedrals||Grancel - Crossbell - Heimdallr - Bareahard|
|Other||Aster House - Primal Ground - Rolent Chapel|
|Concepts||Aidios - Apocrypha - Artifact - St. Astraia - Gehenna - Gralsritter - St. Lianne Sandlot - Merkabah - Pope - Sept-Terrion - Stigma - Sunday School - Templar Sword - Thaumaturgy - St. Ursula|