Editing Warhammer 40,000/7th Edition Tactics/Necrons (section)

===Allies of Convenience===
*'''Tau''' - Shooting, cheap bodies and big nasty suits. Take a squad of Fire Warrriors as the compulsory Troop with a Cadre Fireblade as the HQ to get the most out of them via Volley Fire, then pick something from one of the other slots: mean ol' Riptides from Elites, slippery Seeker Missile-shooting Piranhas from Fast Attack, the magnificent XV88 Broadside from Heavy Support... whatever tickles your fancy. You already have pretty good shooting and much sturdier bodies on most everything, but Tau have plenty to offer you as long as they fill in the holes in your army rather than doing the same as your Necrons but lacking Reanimation Protocols.

*'''Chaos Space Marines''' - Lots of overlapping stuff. Chaos Marines are lesser than your own Troops, but can bring Special and Heavy weapons, which Necrons can't anymore since losing 5th ed Royal courts. Cultists are cheap objective squatters, but a min squad of 5 Immortals is more durable than 10 Cultists. Everything else we have an equivalent version of or better version of, other than maybe Heldrakes and Daemon Princes. Still, they are the easiest way to get Psychic Dice and have some nasty psychic abilities.

*'''Renegades and Heretics''' - Chaos Imperial Guard, more or less. A decent option. If you're running heavy vehicles, they can bring some of their own that are cheap and effective, like Hellhounds or Basilisks. AV Overload! They also have a lot of cheap bodies, same as Cultists but even less points. Can get some really good artillery options, which is something that Necrons lack overall. Better than CSM, that's for sure, and less overlap than Tau. Check if your meta allows Forge World (they should).

*'''Dark Harvest Necrons''' -  So crazy and homicidal that other Necron Dynasties avoid them, the IA 12 supplement (page 102) allows you to break the rules and use these Necrons as an allied detachment to your standard Necron army (or standard Necrons as an allied detachment to a Dark Harvest army). Used mainly for Flayed Ones as these guys use them as Troops instead of Elites, but also useful for fielding FW models alongside a Decurion on the cheap.