Hey
Warhead, welcome to the Metal Menace!
Looks like a good army, but, to an old Necron Lord, some obvious issues.
First off, you don't really ever want two formations with the same "highest" cost, as thay gives your opponent *two* chances to get the "Break Their Spirit" goal be destroying either one.
Which brings me to my second point:  I've never found it good to mix the two types of Destroyers in one formation; it dilutes their strengths.  Have one with Heavies to hunt tanks, and one with regulars to hunt infantry/fire fight, if possible.
Third, I wouldn't put 3 Monoliths in a single formation, even though it seems tough and it's cool to have all those Portals in one place, if it gets broken and "phased out", there's a chance you'll have lost three Portals for the next turn, which can be crippling!  I'd recommend a max of 2 Monoliths in a formation, but it's even more versatile to have single Monoliths with Obelisk bodyguards. I hope you realize that the Warriors, Venators, and Eques formations can *all* come out of Portals if you so desire.
Last, for now, I'd recommend more than one Pylon for air cover.  A single Pylon is remarkably easy for the enemy to shut down, and then their air power has free reign over the battlefield.
Other than that, it's a nasty looking army, and I look forward to seeing some battle reports from you! ÂÂ
