Ever since Aidios bestowed the seven celestial treasures known as the Sept-Terrion on humanity, she has had loyal followers prior to both the Great Collapse and the founding of the Septian Church as an institutionalised religion.
- Aidios in Ancient Greek translates to form, essence, type, species
- Aidios is similar and is pronounced the same way 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 same name of another video game company
|Dominion||Ein Selnate (1st) - Thomas Lysander (2nd) - Kevin Graham (5th) - Barkhorn (formerly 8th) - Gaius Worzel (8th) - Wazy Hemisphere (9th)|
|Knight||Rufina Argent - Abbas|
|Squire||Cesar - Juno - Marcia - Ries Argent - Rosine - Scarlet - Ventus|
|Cathedrals||Grancel - Crossbell - Heimdallr - Bareahard - Roer - Haliask - Ardent - Saint-Arkh - Ordis|
|Chapels||Bose - Rolent - Ruan - Zeiss - Trista - Celdic - Legram - Leeves - Parm - Raquel|
|Concepts||Aidios - Artifact - Gehenna - Gralsritter - Merkabah - Sept-Terrion - Stigma|