The Necrons' new unit isn't an air unit (we used an existing unit for their air unit). No, the new unit for the Necrons is much more powerful. The Necrons now have the ability to call on the power of one of their gods (known to mere mortals as "The Deceiver") to utterly annihilate their opponents on the battlefield.
Those of you that played Dark Crusade already know that the Necron Lord (the Necron hero unit for those of you new to the franchise) can research an ability called Essence of the Nightbringer. This research gives him an ability that allows him to temporarily take on the form of The Nightbringer, one of the Necron gods.
Players that purchase Soulstorm will now have access to a second research called Essence of the Deceiver. This research will allow the Necron Lord to temporarily take on the form of The Deceiver, another of the Necron gods. What makes this feature especially cool is the fact that the two researches are mutually exclusive. If you research Essence of the Deceiver, you can't research Essence of the Nightbringer (and vice versa). This will allow you to make a conscious decision of how you want to tailor the Necron Lord to deal with your enemies.
Where Essence of the Nightbringer is a form that is built on pure force, Essence of the Deceiver is a form built around subtlety and deception. The Deceiver has always been the weakest of the Necron gods in terms of physical power, but his wit and his preternatural understanding of deception have always allowed him to compensate for this weakness. One could even argue that his talent for lies and deception make him the deadliest of the Necron gods.
Even though The Deceiver is physically weaker than The Nightbringer, he is still a living god on the battlefield. He can take on entire armies by himself with his physical attacks, and he can absorb untold amounts of punishment. But if this weren't enough, The Deceiver can also send waves of the enemy fleeing for their lives with a simple gesture, and he can use the power of illusion to draw their fire to phantom images.
If you are one of the lucky owners of Soulstorm, your Necron Lord will have the ability to channel the godlike powers of The Deceiver for short periods of time, and lay waste to your enemies. Let them tremble in fear...