The Os Brethren - Origins
The Os Brethren were the three "brothers" who ruled within Hell's first four realms. The three brothers origins reside in Heaven, as they were once angels within the Gates of Babylon, named Sarasphiel, Inpheriel and Naphranel. Their descent was caused by a source unknown, in which up to this date they lament, unlike most of the fallen angels.
However, after their descension, the three brothers claimed the first four levels of hell, and fought for it well enough for the Lord of Hell to give them the first four realms, ripping it from the clutches of the original owners of them - Mephisto, Diablo and Belial, The Kha Brethren.
Unlike the Kha Brethren who ruled with blood lust and wrath, the Os Brethren were more calculated. They relied on tactics where their strength lacked, and soon enough, had their own followers. The Baphomet are well known for their loyalty to the Os Brethren, as this demon kind valued mental prowess over physical skills.
The Os Brethren's followers were mainly those who were skilled in swift combat, and excellent in tactics. The battlefield is always a chess when following this trio's orders, and they valued minions who could use initiative and make plans within plans.
Sarasphiel/Sgurno/Silencio/Silence
The eldest of the brothers.
"My Suffering Falls Silent In The Darkness"
Main Ability - Foresee: Silence "foresees" the following move of his opponent, and counters it.
Silence carries an eye within it's chest frame that sees many, however, he cannot speak of it. His mouth is sealed forever by the Guardians of Babylon pre-descendence, where he was known as Keeper of Secrets. He carries this title through his post-descendence. His Knowledge is handed down in written tomes to the most loyal subjects.
Naphranel/Napharo/Niztiro/Nitro
Mark- The Two Headed Serpent
Main Ability - Toxic Imbalance: Nitro alters the levels of elements, causing them to be toxic/imbalanced.
Nitro's body contains/produces serpents. His blood is venom, however, this venom, like a serpent's venom, can be used to create powerful medicine along with fatal poisons. As the Angel who tamed the basilisks, Nitro was crowned as Serpent Guard within the Guardians of Babylon. His knowledge is used for medicinal purposes.
Inpheriel/Inaspharo/Inpharno/Inferno
Main Ability - Flame Phlactery: Inferno can tear shards from his spirit and cast them out to other domains when he's close to death, so he could be reborn in a host should one of the shards survive within a living body.
Inferno's wrath burns within him - quite literally. His skin is molten though can look like normal skin, within him he has nothing but flames. His skills pre-descendence was used to ressurections, and he was dubbed the Phoenix Guard within the Guardians of Babylon. Post-descendence, his skills in rebirth and spirit mastery is well valued. His knowledge is passed down to those who managed to survive his brutal tests of the flame.
Inferno's first death has occured within the War of The Sanctum, which was an assault performed by the Kha Brethren. Though the attempts were valiant the push the Brethren back down to their own realm, Inferno had to severe his soul and part from his brothers, casting his entire domain on fire along with his followers - all were charred into nothing but dust.
A small shard lodged into a dying man's chest and remained dormant until the man met with the Hybrid Leader, and became one of her Guardians. This caused the shard within the man to awaken and finally, fully merge with him instead of allowing him to master his skills on his own, unlike how he was handling things before Inferno's awakening.
Whilst Inferno journeyed through life with his new found allies and friends, the remaining brothers suffered - their main strength was gone, and their rule was growing weak.
After the Terrian War between Hybrids and the robot race of Quatren, Inferno's powers finally peaked - and he descended back to hell with his new allies to evacuate his brothers and their followers to the Hybrid Domain, Terrian. Before this was managed, the mentor of the Hybrid Leader, a fallen angel named Aru assaulted Inferno. The wounds he had inflicted to Inferno caused him to fall back into a dormant state whilst the mortal body recovered, delaying the assault planned on Hell.
Within this period, the Battle Of The Lasting Flame broke, and the Os would have been permanently destroyed - if it wasn't for the help of a Lich Dragon who had been crowned the Mother of Afterlife, along with a demon knight, Kanto. The remnants of the Os Brethren were evacuated, and the first four realms of Hell became inhabitable for the following 10 years.
Now the Os Brethren resides within Terrian, along with Inferno who has recovered once more, and their tutoring within the domain continues.