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The Khaos Brigade, also known as the Army of Disaster, is an organization in High School DxD. The Khaos Brigade consists of multiple races: Devils, Fallen Angels, Humans (who are descendants of legendary/mythological heroes), and a few (unfallen) Angels. They are the main antagonists of the light novels from the Birth of the Breast Dragon Emperor arc to the Heroic Oppai Dragon arc.
The Khaos Brigade was created by Ophis, the Dragon God of Infinity, with the sole purpose of removing the Great Red, the most powerful Dragon in existence known as the True Dragon, out of the Dimensional Gap.
The Khaos Brigade introducing themselves and began to start many terrorist attacks, such as attacking the VIPs during Rias' Rating Game against Diodora, kidnapping the Youkai leader, Yasaka, and committing many other atrocious acts.
Later the Hero Faction betrayed their leader Ophis after Cao Cao, the leader of the Hero Faction, sided with Hades, the God from the Realm of the Dead, and used Samael to steal most of her powers under the intention of creating another Ophis. This has resulted in the latter remaining in a presumed powerless state. However, Ophis released her powers in the form of snakes before Cao Cao came to steal her powers. As such, Ophis did not lose most of her powers.
The Hero Faction was greatly weakened after the loss of their leaders. Indra sends their most powerful members (Cao Cao, Leonardo, and Georg) to the Realm of the Dead, taking all of their Longinus from them. Jeanne and Heracles were captured by the Devils and Fallen Angels for interrogation, while Siegfried was the only main member of the Hero Faction who died in battle.