I'm currently working on a long campaign centering around the Necrons in the Jerico Reach, there's a lot of Dead Worlds I could use for missions and many ways in which I can make the players lives that little bit more interesting, I've run into a few issues though.
My players are currently in the Canis Salient and Ebongrave will rear his ugly mug towards the end of their current mission and will act as a protagonist for the next campaign (I plan on keeping them in the Canis Salient and possibly a cease fire with the Tau) along with the Necrons and their goals although they will act as more of a catalyst for interactions with Ebongrave. I'll be using his household gaurd, the 14th Mortressan Highlanders, to act as his agents: interupting missions, starting firefights, sabotaging equipment in an attempt to bring the ceasefire to an end in addition to Ebongrave issuing unrealistic orders to the Kill-team. The problem is figuring out an escalation and a way to test the players patience with an individual they're unable to just kill.
I'm also having trouble coming up with a way to defeat the Necrons, currently I'm working with an Inquisitor on the planet Regulos inadvertently activating them and the Regulos Tomb-World being a hub of some sort which if destroyed will stop more Necrons being awakened, but I don't know much about Necrons so was wondering it's feasibility.
Any help would be appreciated.