Happy Thanksgiving BoLSers!

I will be facing off vs a Necrons list on Saturday, and it will feature a Transcendant Ctan with the D-hellstorm and 6d6 shot weapons, plus I think 2 Monoliths and assorted warriors, not too many, if any, flyers.

To have an appropriate battle, I want to use my Lord of Skulls, upgraded with the Skullhurler and Daemongore cannon, though I'm wondering if the standard gatling cannon might be better in this case?

But to accompany the Lord of Skulls I am thinking about this:

Belakor (to make the big one invisible)
Flying Daemon Prince of Nurgle with the Grimoire and Mastery 3
2 x 3 Nurglings
2 Blood Slaughterers

Or would going a CSM route be better? I would sacrifice a Grimoire, but I could get Belakor and hopefully weapons virus if I take a Nurgle Sorcerer or Prince. Then in stead of the Blood Slaughterers I could get some melta bikers to zip in for the monoliths or something like that.

I was going to be pure Khorne and fluffy, but I don't think this particular match is about that Though Kharn and Chainfist Termies could handle the monoliths as well, hmmmmmm.