Little is known about when Arcadius joined the Army of the Light, and less is known about when he became a Lightforged. He rarely speaks about his trial, instead choosing to focus on the future. Arcadius does not like to dwell on the past. The only thing he willingly reveals is that he has been with the Army of the Light for "thousands of years."
The massive draenei is polite, extending a simple courtesy to almost everyone he meets. While he honors the power of the Holy Light, he has also gained an understanding of what blind zealotry can do. Arcadius knows how easy it is to get lost in the throes of battle, and he has stepped over the line on more than one occasion, only to have to force himself back in order to regain control.
Arcadius served under Rephaia as one of her wingmen in the Army of the Light, having joined her warframe squadron during the battle for Argus. He is a skilled pilot, and takes pride in the maintenance of his personal warframe. He would have taken his position as commander of the squadron after Rephaia stepped down, too, but she instead convinced him to meet with Ardell Magrave.
Curious about the purpose of this “AESOP”, Arcadius has now stepped into Rephaia’s former position among the organization.