The Old Satan Faction (旧魔王派 KyūmaŌ-ha) was group comprised of pure blooded Devils that fanatically supported the world domination ideals of the original Satans, Beelzebub, Lucifer, Asmodeus, and Leviathan, had allied themselves with their descendants.
After the organizations dissolvement after the Devil Civil War, the remnants of the Old Satan Faction were scattered through out the Underworld. Several hundred years later, the organization was reformed as a wing of the Khaos Brigade, becoming its largest faction.
The Old Satan Faction was formed during the Devil Civil War, when a group of Devils decided to continue the Great War in order to fulfill the Original Satans' ambition of world domination, while another group of Devils was against it, resulting in a Civil War among Devils, with the victor being the new Government of the Devil side of the Underworld, while the losers where forced to go into hiding and the original Four Great Satans became known as the Old Satans.
Even after being defeated by the new Devil government, the Old Satan Faction remained active and continued to cause trouble on the Devil side.
The Old Satan Faction was the only group of Devils who resisted using the Evil Pieces, as they believe them to be a disgrace to Devils because they reincarnate Humans and other races into Devils. They were also against the Devils' current political system of peace and pacifism and sought to change it by overthrowing the current Satans as their ultimate goal was to destroy the current world by creating and spreading chaos and recreating it into a world under the dictatorial rule of the descendants of the original Satans.
Sometimes prior to the main story, the Old Satan Faction pledged allegiance to Ophis in order to borrow the Ouroboros Dragon's power, for the sake of world domination, thus becoming the largest faction amongst the many factions of the Khaos Brigade. They eventually reemerged as part of Khaos Brigade, as one of its leaders, Katerea Leviathan, led the attack at the peace conference of the Three Factions, attempting to kill the leaders of the Three Factions in order to spread chaos throughout the Factions as a beginning to realize their plans for world domination, but was killed by Azazel instead.
The Old Satan Faction eventually launched another large-scale attack on the Underworld with the help of Diodora Astaroth. However, like their previous attempt, it was thwarted by the leaders of the Three Factions along with the allied forces from other myths, resulting in the loss of another of their leaders, Creuserey Asmodeus, while another, Shalba Beelzebub, was heavily injured.
Following the failed attempt during the Rating Game tournament, the Old Satan Faction formed a truce with the Hero Faction. After the Hero Faction betrayed Ophis, Shalba, who had gone insane by then, forced Leonardo into a Balance Breaker state in an attempt to destroy the Underworld by generating powerful anti-monsters. He was then killed by Issei, as the anti-monsters began to rampage in the Underworld, in a conflict known as the Demonic Beast Riot.
The remaining top members of the Old Satan Faction and Siegfried then approached Ajuka Beelzebub during the crisis of the Underworld, offering him a place in the Khaos Brigade, while other members participated in riots in the Underworld, taking advantage of the chaos. However their offer was rejected by Ajuka and they were swiftly terminated, with a great deal of their members being defeated. With the third defeat, the Old Satan Faction lost the majority of its forces and was forced into hiding, unable to take any further action being disbanded as a result.
After the Devil Civil War, most of the members of the Old Satan faction were killed off or imprisoned while those that remained free were forced into exiled by the New Satans, vowing revenge. The faction later reformed under the umbrella of the Khaos Brigade, using Ophis as a means of gathering power.
All the leaders of the Khaos Brigade Old Satan Faction were killed by the events of the Demonic Beast Riot and the majority of its forces were terminated by Ajuka Beelzebub in Volume 12, further weakening their faction to the point of them being incapable of taking any further actions.
|Bidleid Bashalun Beelzebub||Beelzebub Clan||Deceased|
|Tsufaame Tereaku Leviathan||Leviathan Clan||Deceased|
|Damaidosu Zereikel Asmodeus||Asmodeus Clan||Deceased|
|Lord Lucifuge||Lucifuge Clan||Deceased|
|Katerea Leviathan||Leviathan Clan||Deceased|
|Creuserey Asmodeus||Asmodeus Clan||Deceased|
|Shalba Beelzebub||Beelzebub Clan||Deceased|
|Rizevim Livan Lucifer||Lucifer Clan||Deceased|
|Grayfia Lucifuge||Lucifuge Clan||Alive
|Euclid Lucifuge||Lucifuge Clan||Alive
|Zaorama Nebiros||Nebiros Clan||Unknown|
- The Old Satan Faction had two iterations: one during the Devil Civil War and the second which was part of the Khaos Brigade.
- The Old Satan Faction was the largest faction within the Khaos Brigade before it's dissolvement.
- Despite the Lucifer Clan's influence, its members (Rizevim Livan Lucifer, Razevan Lucifer and Vali Lucifer) either left the faction early on before the major conflict the faction faced (Rizevim Livan Lucifer and Razevan Lucifer) or opted not to join at all (Vali Lucifer).