Zenon Griffey/Chronology

Past
Growing up as a child prodigy and having taken several championships under the apprenticeship of a former Bushin Festival champion, Zenon Griffey climbed up Midgar's hierarchy until finally settling down into the position of an sword Instructor at their Royal Spellsword Academy. Within the kingdom, no swordsman knows not of his name. Unbeknownst to many, Zenon was secretly affiliated with the Cult of Diablos and sought to elevate his position to a member of the Knight of Rounds.

When the Cult's leadership recognized his strength, they considered making Zenon a prime candidate to fill the vacant position of the 12th seat. However, they noted that he lacked the achievements and waited for an opportunity. Zenon eventually found a chance when he was arranged to be Princess Alexia's betrothed and It was then that he realized that he could harvest her royal blood for the Cult's experiments.

Kidnapping of the Princess
He was first introduced training students at his Royal Bushin elective after Alexia started "dating" Cid, a lower-class aristocrat. Zenon confronted her about her phase and told her that she'll grow out of it and see himself as a good choice. She rebuffed him however and as the days went on, Zenon simply smiled at Alexia's attempt to get a rise out of him, much to her annoyance.Sometime later, he secretly kidnaped her and framed Cid for the crime. Zenon alongside his followers arrested Cid for her "disappearance" and tortured him in the interrogation room for a false confession. Despite their malicious torment, the young man did not relent on his innocence. Zenon later visited Iris Midgar to state that he felt responsible for her sister's kidnapping and reported on Cid's "interrogation". He reported that the interrogation lasted for five days to come with nothing before Claire barged in to confront her about her brother's condition. Iris then decided to release him under the surveillance of Zenon's men.

Later on in the night, the mysterious organization called Shadow Garden raided the cult's hideouts in the capital and forced Zenon to retreat to his facility to find Alexia. It was around there he found her broken free from her confines and she confronts him. In the confrontation, Zenon revealed himself as a member of the cult and prime candidate of "Round Knights" before belittling the confused princess. Surprised that the enraged princess landed a strike, Zenon overwhelmed her breaking her sword in the process. Before he proceeded to recapture her, the combatants were surprised when Shadow suddenly appeared to intervene. Shadow easily outmaneuvered his attacks and mocked the knight's underwhelming strength, infuriating him.

Consumed by rage and frustration, Zenon shallowed a small jarful of Diablos Tears to empower himself and become a "Third Awakening". Despite mutating from the pills, Zenon was still no match for the dark figure who used his own belittling words against him while overwhelming him. Shadow rebuked that there's no road to almightiness from borrowed power until he activated his magical power, shocking Zenon on how powerful it was. After Shadow finished his belittlement with a story about a man that withstood a nuclear bomb became nuclear himself, Zenon thought he was crazy and tried slashing him. Alas, his sword shattered upon hitting the mysterious figure when he told told him to witness his almightiness as he uses it. Realizing he lost, Zenon was in despair as he annihilated him with his "I Am Atomic" attack.

Legacy
After his death, several students dropped out of the Royal Bushin elective after his actions behind Alexia's disappearance came to light. Because of this, the Royal Bushin fighting style was sullied as a result of his actions and both his name and former subordinates were scorned for their involvement. However, his death revealed the existence of both the Cult of Diablos and Shadow Garden to Midgar and the public. Due to this, Iris created the Crimson Order out of distrust towards the Knight Order and the Cult was forced to take action and frame Shadow Garden as the world's enemy to avoid internal exposure.

In the event of his death, certain higher ups within the Cult have sought to claim the position of 12th seat. The first member was Lutheran Barnet who sought to regain his position through using the Eye of Avarice but failed when he met same fate as his supposed replacement. The second and last known member to have sought the position was Doem Ketsuhat who attempted to do so politically through sieging the Kingdom of Oriana within.

Volume 5
Zenon was briefly mentioned by his teacher when he was confronted by Shadow after nearly incapacitating Alexia and Claire. The Head Librarian knew this would eventually happen after learning of his student's demise and sought to avoid it. In his dying moments, the Head Librarian noted that he was a terrible student before revealing that the quantity of Diablos Tears were plummeting and warned the princess to avoid following his footsteps before passing.

The Head Librarian's testimony and incident was later collected as evidence when Alexia tried pleading to her sister. However by the time she collected the evidence, it was too late as the Cult has already infiltrated both the Academy and Crimson Order with members such as Isaac and Hubb respectively.