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

===Allies of Convenience===
*'''Tyranids:''' Makes up for the lack of a good Tyranid ally. Shame that you cannot share Psychic Powers and Warlord traits due to AoC, but them's the breaks. This gives you access to even cheaper tarpits plus the famed Monstrous Creatures the 'Nids are known for. Recommended to grab a Flying Hive Tyrant as allied HQ for some form of flyer/AA.
**''Flyrants in a Genestealer Cult:''If you're running Tyranids as your ally rather than the other way around, the most immediate combo is to take the Tyranids either in a CAD or Leviathan Uprising, pay the minimum Mucoloid Spore tax, and take 2-3 Flyrants. Likewise, although Broodmind is an excellent Psychic Discipline, the Cult can find itself easily strapped for Warp Charges and while the Tyranid Psychic Discipline is fairly underwhelming, the Tyrants each provide 2 Warp Charge; an extra 4 Warp Charge can give you a lot more flexibility in playing Cultists as a "Controller" army.
**Bear in mind that Shadow in the Warp affects Allies of Convenience. This may or may not be a problem, depending on your army loadout, but it can make Perils more dangerous for your Magus and Patriarch. In addition, remember that GSC and 'Nids count as enemy models for the purposes of things like Infiltration. Keep that in mind, as your dudes might be getting in each others way a lot.
**Your 'nids now have access to psykers that can take telepathy and thus psychic shriek. Now think about Deathleaper and his bros from the Assassin brood formation and their ability to lower enemy's Ld. Fuck you, daemon prince. Bonus points, it's fluff.
*'''Imperial Guard/Astra Militarum:''' Yes. Apparently IG can ally at AoC with GSC as well, must be to represent when the cult gets into the local PDF. This gives you access to Valkyries, Vendettas, Hydras, and any Imperial Guard vehicle you don't get in the main Cult Codex. For fun, include a Deathstrike in your Astra Militarum detachment for full-on, <s>mustache</s> Feeder Tendril-twirling, super-villain doomsday weapon hilarity. Also, with the benefit of orders, they can do Lasgun Spam much better. You complement them on the Melee side, though. Plenty of options here.