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The Bane of the Old Ones
Arcerak was always sneaky. Even before the biotransferance. Using vestments that seemed to steal the very light itself from the air and teleportation, he and his legions would strike upon the Old Ones when they were most vulnerable. The horror this spawned in the Old Ones pleased the Silent King. It pleased him so much that he rewarded Arcerak with three gifts. A sigil that could summon the forces of the Triarch, the power to turn light to darkness and his force was given training with some of the strongest Crypteks to increase his mental will tenfold, so much that he could take over the minds of lesser creatures. With these gifts in hand, the lord wrought destruction on an even greater scale. He brought down entire planets of the Old Ones in mere hours.
Rebels
When the time came for the transference to undying metal, The Lord of Shadows (as the necrontyr had come to call him) refused the transference. He stated that the new bodies would take away from the splendor of victory (and the delights afterward). The Deceiver came forward with a deal. He said he would seal away the bodies of the Harbingers of Darkness so that they could return to them when they so desired. The Harbingers of Darkness agreed to this. The Deceiver planned to destroy the bodies once the Lord’s and his force’s minds had deteriorated. He did not count on one thing though. The Lord of Shadow had an extremely strong mind, even stronger thanks to the Silent King’s gifts. His mind was so strong it kept his entire force’s minds from deteriorating. Enraged by this the Deceiver tried to destroy the bodies.
When he reached the chamber the bodies were kept in, he found all the Harbingers of Shadow waiting for him. They had been tipped off by a C’tan that seemed almost too happy to deliver the news.
The force would’ve been a small challenge, but with the Lord of Shadows backing them up they were a threat. Choosing to deal with them later, the Deceiver left. Angered by this betrayal, the Lord set two primary goals for his force. They were: 1) Find a way back into their original bodies and 2) Destroy the C’tan.
The Mission
They set about the destruction of every C’tan they could find. They would ambush the C’tan and when they shattered they would use thousands of tesserect labyrinths to trap all the shards. They tried numerous times to destroy the Deceiver, but it had become stronger through absorbing the essences of other C’tan. They could also never find its tomb. The scientists they had assigned to bringing them back into their bodies worked tirelessly. By the time of slumber they had made it where when one of them left their metal body its mind went into its original form for a brief amount of time.
The Great Sleep
Being one of the few who knew the Silent King the Lord was able to convince him to spare his force from the slumber. The King allowed the Lord and a few others to stay awake. While his force slept, the Lord stayed ever vigil. He could not let his force’s minds deteriorate. During this time his court stayed with him. Unlike most other courts his was made entirely of Crypteks. These were the ones who had been working on undoing the biotransferance. During the long sleep they helped the Lord keep alien scum away from their worlds.
The Great Awakening
Arcerak awakened his force soon after the Horus Heresy. He took the opportunity to take many of the imperial worlds surrounding his own. He now has control of twice as many worlds as the Stormlord. Luckily, Arcerak is far more subtle about this. Before he attacks, he knocks out all communications. After he has taken over the world he has messages sent out to make it seem as if the world is just the same as ever. Due to this, few except the Eldar know that his force even exists. They will not know until their skies darken with his ethereal darkness.

So how's that? If enough people like it, I will post more.

Looks good so far. However, I'm not sure if it would be believable if Arcerak had more worlds than Imotekh. Plus, wouldn't not sleeping in a Tomb World make him more vulnerable to attack? Just some things that might need more explanation.
I would gladly invite you to read my own fluff, here:
http://www.dakkadakka.com/dakkaforum/posts/list/433674.page

I see your point. I'll probably downsize it a little. As for the whole being open to attack thing, well, the next peice I do will have to do with his royal court and how they help him guard their crown world and improve him and make him BA.

Yeah, it's not too shabby for the most part but there are a couple things I'd like to downsize:

A) What the good Doctor said

B) As much as I love the idea of whooping Old One ass, it needs to be adjusted to be more fitting with the fluff, you could make it that at the start of the War in Heaven, he got off to an impressive start with lightning fast attacks upon several worlds of the Old Ones which resulted in a massive withdrawal of the forces of the Old Ones. But though he and his forces moved lightning fast and crumbled many worlds, the Old Ones retaliated and thanks to the Webway, were able to outmaneuver him. Finally over a couple centuries, his empire was forced back unto the fringes of the galaxy alongside his brethren.

All right. I'll edit the piece soon