Chaos.
It was everywhere, all-consuming. It was the force that drove the creatures of Oblivion forward from their gates into battle - into war. It was the feeling that consumed the inhabitants of the Imperial City, that drove some to battle and others out of their homes and into the night. It was a force that had no effect on the Redguard, Mu'lam Sayiir. A bandit in his youth and a decorated mercenary now in adulthood, chaos was the very thing that Mu'lam thrived upon. It was the fuel for his personal fire and a weapon he wielded more masterfully than his sword. Daedra charging, women fleeing and men bracing themselves around him... the feeling of chaos was everywhere - it surrounded him, and he embraced it the way an addict embraces another bottle of skooma in the late hours. Chaos was a drug on which Mu'lam thrived and on this night, it made him unstoppable. All through the battle, his blade tasted the blood of Daedra again and again and again. While the men around him fell, he alone stood. When the air was filled with screams, his shouts of glory silenced them. When all was lost, he could be found. Mu'lam battled them back to the very gate from which they came, and he battled further.
Even into Oblivion itself, he would not be defeated - his advance would not be stopped. It was not for home nor country nor even his own soul that he fought, but simply for the fight itself. This night defined his life - his very existence - and he would wish it never to end. But it would end and though his mind was consumed by the thrill of the fight and the very chaos from which it had spawned, he never forgot that. So it was on the very border between Tamriel and Oblivion that Mu'lam made his stand and it was not long until he battled Daedra on both sides, surrounded and surely to die... but he would not die this night. For even as the young Redguard mercenary from the sand seas of Daggerfell battled on the line between two realms of existence, another hero battled inside the city and, together with Martin Septim, they would end this battle, this war, this 'Oblivion Crisis'. Mu'lam would receive no mention nor any reward. His name would not be recorded in history books as a man that single-handedly battled armies on the borders of the two realms. Mu'lam would die as an old man, alone. He would not die this night.
So it was that Martin Septim became the Avatar of Akatosh and battled the Daedric Prince, Mehrunes Dagon and banished him back into Oblivion. So it was that that portal began to close and Mu'lam remained, continuing his fight until the last moment. When he killed the last Daedra that rose to challenge him, he turned to leave Oblivion behind and fully return to Tamriel. That was when something within Oblivion reached out and grabbed his arm, pulling it back. Mu'lam struggled to fight the limb that had risen from the piles of bodies, but more rose to assist it, threatening to pull him back in completely, but he resisted. When the portal finally closed, Mu'lam remained in Tamriel, though his left arm was now gone from the elbow down, the skin already closed, black and red as Oblivion had been itself. He returned to his life, his payment for participating never coming, wandering Tamriel in search of those in need of his particular talents.
However, for a mercenary with only one and a half arms, work is hard to come across. The work he received was little while the cost he payed was great. So troubled were these times for Mu'lam that he began to seek out how to get his arm back from Oblivion. So it happened that Mu'lam came across the presence of another Daedric prince - Clavicus Vile. A prince of wishes, the Redguard had only one - the return of his arm. So delighted with this wish, Vile made no effort to taint it with trickery and deceit but instead did simply what was requested - that, in itself, was trickery enough. For, during it's years in Oblivion, Mu'lam's arm had changed. It had become tainted with the very essence of Oblivion itself and when it was returned to the man, fused back into place, that essence seeped into his very soul and Mu'lam Sayiir became a new man - a deadly man, made of pure and complete chaos. On that day, Mu'lam did die, but he would not truly enjoy death for many more years.