Moros

"(Unlike any Sith before or after him, Moros, was considered the driving force fo the Dark Side.)"

 was a Dark force, long before the Sith emerged. (expand and explain)

Biography
Gathered from his holocron, which he created around 3000 BBY, Moros, took no title other than his own name. There was no need, and no reason. The world he had been recognized on was gone, all life exterminated in his conversion to the Dark Side. Even from a world he could not leave, his influence, his voice permeated all who were tempted by the Dark Side.

Early life
Little is known about his birth and early life, as even he chooses to either not tell or chooses to forget. From what can be gathered is that he was no more uncommon than the average Shola.

Career
His descent into the dark side was due to not a seeking of power, nor was it for knowledge, but for revenge, for the death of his family, for the death of his wife, and for those of his children whom he saw slaughtered before his eyes. But what was revealed to him by the last person he needed to kill was that it was not he who had killed them But Moros himself had killed his family in his paranoia. His Anger burned against himself and to everyone on the planet, both his anger and fear broiled into hatred, and even deeper etched with all the suffering he endured, and suddenly his connection to the force locked, and he was consumed by part of the force that is recognized as the dark side, he became not somone who used the Dark Side, he became the Dark Side. He became the vile sentience that became the voice, the personality, the shadowy manifestation of the force driving the Dark Side.

With the creation of Infinite Empire, and the construction of the Star Forge his power manifested and grew. He felt the presence of the Son, the Daughter and the Father, as they drank from the fountain, and bathed in the pool. With the fall of the Son, his power exponentially grew, everyone who fell to the Dark-side increased his power. Abeloth, became his consort, and likewise they were both forces of nature, dark powerful. Unlike Abeloth, he was such a force that he could not be fought personally. To do so would mean death by looking upon the evilest manifestation of the force in history.

Death
In 7000 ABY he made his presence known. Having left the confines of Shola, and seizing control of Coruscant, of which he poured out a pestilence of the dark side which devoured all life on the planet, turning the world into a force of darkness which seeded other worlds, until all the galaxy fell under what became known as the Age of Moros. In this time, the only hero's powerful enough to emerge were those who completely destroyed the darkness within themselves, and when they numbered in the millions and made their way to Coruscant for the final battle in 7969 ABY, they destroyed him not with lightsabers, but with complete merging with the Light Side of the Force, which fought him personally. The battle of wills was so powerful that entire worlds exploded all across the galaxy. But after a battle which left only seven alive, they finally slew him. His body exploded in an explosion of blackness, that sent off a shockwave, that upon coming in contact with objects strong in the Dark Side they were destroyed or depowered. At last, the Dark side could no longer tempt, the galaxy any longer. It had lost its voice and power at last. Moros was gone.

Post-mortem
Following the Death of Moros, it is said that the galaxy endured the first million years of peace before others began seeking out the dark side, but none could ever be as powerful as they had once been, the force was seemingly forever tipped in favor of the Light Side of the Force. However, unbeknownst to them, on Shola, in the darkest of temples, Moro's spirit lingered on waiting for a new apprentice, to take up his mantle and restore the Dark Side to Power. He awaits their for you now.

Personality and traits
Prior to merging with the Dark Side, Moros was just like we are, he had his own personality and feelings, but once he merged and became the Dark Side he no longer maintained a personality similar to corporeal beings. He was the very essence of the Dark Side, Fear, Anger, Hatred, Luster of Power, Control, and Outright Evil, were his delights.

Powers and abilities
Arguebaly the most powerful incarnation of the Dark Side ever,

Behind the scenes
I got the inspiration for the Name from the Greek Primordial Force of Doom which just so happens to be Moros, and widely considered everywhere I have looked up to have been the most powerful Greek Divinity of all.