Sebastion

Technically, they’re not spirits but rather extremely advanced AI’s developed based on Ethos, the AI of the Ytherion. They jointly control the Red Spire Network, Sebastion the Aurean side and Matthias the Aynic side. They can manifest themselves as a person through the use of android-type constructs. Both physically and within electronic displays they appear as adult human males.

In accordance with the Book of Deian, Sebastion is based on one of the early humans, and Matthias was the name of a soldier the original Sebastion fought alongside. The original Sebastion became a living soul after being consumed by a Monolith Crystal Core as he destroyed it, and later met Deian and told his story to her. As Deian respected his self-sacrifice, she created a copy of his memories and personality to create a new one of him when he finally faded away (living souls at this point existed within an identical plane to Aurine and didn’t last very long). After Deian’s death, however, the data of Sebastion, left behind in the great temple Qalacard, was used by Maharafara to create the current Sebastion. Matthias is for all accounts and purposes a copy of Sebastion with a different name and a modified personality.