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Long ago, two angels were born from the essense of good, whether previously mortal or purely divine in nature it is not known. These angelic twins, Seraphitus and Moriphractiel, fought side by side in the War of Pesh, aiding the celestial hosts, quickly making names for themselves. And so it was decided, by the powers of law and the gods, that after the signing of the Pact Primeval, all remaining angels would be divided between the two. Seraphitus advised the lawful angels from the Alabaster Spires in K'un-L'un, while Moriphractiel led mighty hunts across Panagea, the Beastlands and Arborea, training the chaotic angels to hunt and watch, ever ready.
As time passed new angels rose to the level of the twins, and they welcomed them with open arms, seeking new brothers-in-arms. But Seraphitus secretly councilled Moriphractiel to avoid the others, not trusting those who had not been born in times of test by flame, proving mettle by hardship and war. These were softer angels, born of mortal virtues and deeds, and were thus flawed by mortal natures. A dark seed was planted by these words in the mind of Moriphractiel, and he withdrew to Pangaea, taking the angels directly under his command to the demiplane as well. Where once he had been an angel of strict emotion, unbridled joy, limitless sorrow, titanic fury and unquenchable lust, he now was ruled by a new master, doubt. It gnawed at his soul, causing him to place his faith in the vast beasts of Pangaea over the other angelic paragons, even sending his host of angels away to serve his brother.
Often he would send his astral form out upon the planes, spying on the "machinations" of the other paragons, and often having dalliances with mortal women, leading in those formative days of mortalkind to the Bloodline of Moriphractiel, a bloodline now weak and muddied ages later. Those who carried this bloodline often became great heroes, or great villains, the angelic blood giving mighty strength, burning passions, and keen minds.
While Moriphractiel fought a shadow war against non-existent enemies, Seraphitus carried on with his own goals. The advent of the new angels had left Seraphitus with little to do, and many angels to do it with, and so he sought new goals and aspirations, joining the Blood War for a short time, fighting on neither side but revelling in the bloodshed and death as the fiends threw themselves at each other, endless waves of tanar'ri breaking on the iron-wrought shield walls of the baatezu. Whenever one side would gain the upper hand, he would capture and kill their spies, cripple their supply lines, destroy their diviners, anything to leave the forces without vital knowledge and resources that would guarantee victory. When news of his actions reached the ears of the gods, they brought Seraphitus forth in chains to stand trial.
All wrong-doing was scourged from Seraphitus by Scarumaiel using the mists of Avalon, and the gods sent Seraphitus to parley with the now estranged Moriphractiel, hoping to assuage his fears and bring him back to the host of angelic paragons. When Seraphitus finally found his brother, he was more animal than angel, a furious monster of tooth and claw, bristling wings battered by titanic clashes with the prehistoric denizens of Pangaea, formed covered in literal "vines of doubt", sprouted by the seed planted in his soul long ago by his brother. And Seraphitus smiled.
The mists desperately sought to extinguish the smoldering coals of evil within Seraphitus, and he in turn sought to place them in another. After confronting his brother, he reached out with a hand and touched his face, Moriphractiel looking into his brother's eyes, and the lost angel spoke but three words, "End this please." Seraphitus, a loving smile on his lips and a twinkle in his eye, let the mists slip forth into Moriphractiel's body, scourging his soul and mind, attempting to redeem him, instead leaving him with naught by his wild and monsterous form, his soul convalescing in Seraphitus' hands. With this, Seraphitus fled to the Outlands, and from there entered K'un L'un, stealing into his Alabaster Towers and setting about fortifying it against attack. Each of the angels under his command underwent an apotheosis, the male angels becoming foul dark-scaled drakes of shadow, and the females becoming beautiful winged creatures similar to the erinyes of Baator, though wrapped in sharps wires and blades, wearing metal masks, never showing their visages.
With his soul in the hands of his brother, Moriphractiel merely runs about his demiplane like a great beast, having no need to eat, rest or drink, leading him to simply run. Three distinct factions still revere him: Those that revere him as a paragon of emotion, those mortals who hold a portion of his potent blood, and those who believe he is running in order to reveal a universal truth, and that this truth will restore his mind and lead him and his followers to great power and knowledge. No evil may harm him, as he has received the blessing of each of the five angelic paragons he so dearly distrusted, giving him strength, purity of form, courage, and the protection of both the spirits and the gods, preventing Seraphitus from taking anything else from his brother.
Seraphitus ever sits in his Alabaster Towers, never leaving his throne at the most reinforced part of the towers, at the heart of a keep so strongly fortified that the sounds of battle outside don't even shake the crystal goblet in his hand. Seraphitus is waited upon hand and foot by his "maidens", while his "beasts" war against the armies of the angelic paragons outside. Sometimes, while falling into a "deep sleep", Seraphitus will send out an astral form in the shape of a great black drake, smashing the armies of good, or destroying temples or libraries, ever lashing out at knowledge to make others weak, so that he might be strong.