Editing Warhammer 40,000/Tactics/Militarum Tempestus(7E) (section)

===Allies===
'''Battle Brothers'''
As a rule, either through mass number like the Militarum, or good saves like marines or sisters have, the battle brothers of the Tempestus are the "anvil" to the hammer of the small numbers of Scions.
* '''Astra Militarum''' - Now that you don't need Troops to hold your Objectives, the only need for Scion Troops is for them to have Objective Secured, or because you have filled out your Elite slots with Scions and want even more of them.  If Scions are your main detachment, the AM can provide the numbers and heavy artillery that the Scions lack.
* '''Adepta Sororitas''' - They don't have anything better than you besides their AoF and power armor, so if you're expecting something effective out of this, don't waste your breath.  If you want Power Armored infantry anchoring your force, Space Marines are stronger and faster for a little bit more points, they can bring flamers too, just not effectively. As for ranged shooting? Say hello to Grav-cannons and Legion of the Damned. Seriously.
* '''Blood Angels''' - More Deep Strike with your Deep Strike. Supplements the Blood Angels' Assaults with AP3 mid-range shooting and MOAR special weapons.
* '''Dark Angels''' - Amazing allies. Vice versa, MT as allies brings them the fliers they need, and cheap scoring units (when taken along with Deathwing) makes their job easier at hunting <s>the Fallen Angels of the chapter</s> <s>Cypher</s>THE ENEMY OF THE EMPEROR THAT HAS NO RELATIONS WITH THE DARK ANGELS!! (Or Cypher...)
* '''Deathwatch''' - Imagine Space Marine Sternguard as an army unto itself. These guys bring more deep striking along with the chance to hit enemies very hard with Heavy Thunderhammers, Powerfists with Auxiliary Meltaguns, and various other tricks.
* '''Imperial Knights''' - Taking these things can take a fuckton of heat from you.  Just make sure the Knight can actually survive whatever you throw it at.
* '''Inquisition''' - These guys are excellent. Even a barebones inquisitor with servo skulls allows your deep strikes to become far more precise. Not only that, they can take flexible amounts something you lack sorely: HIGH STRENGTH SHOOTING. Throw 5 Jokaero in a Chimera to powerwash hordes with Heavy Flamer templates, or stick them in the backfield to pop off lascannon shots from within their metal box. Give your Malleus Inquisitor a hellrifle for an S6 version of your lasgun, or hand that Xenos guy a conversion beamer to blast dudes from across the table. Melee units are relatively lackluster because of T3, but you can get cheap Razorbacks and Chimeras with psybolts (+1 S to all bolters) and fairly cheap bodies and firepower with Acolytes (taking either normal bolters or storm bolters). Psykers are good too with prescience, or even psychic shriek (and praying for invisibility).
** '''Officio Assassinorum''' - Not an official army, but you can take one of the 4 assassins for a specialized killer in your army. The Vindicare takes care of ranged threats, the Callidus pops out and kills the HVI of the enemy, the Culexus for anti-psyker killing, and the Eversor for just plain killing. If that's not enough, take the Execution Force Formation to get all 4. It's a big points sink, but each Assassin is a huge threat on its own.
* '''Grey Knights''' - "I never created anything called Grey Knights." Emperor Text to Speech jokes aside, they are similar to the Inquisition. They make up their lack of ability to be a free allies detachment and being the Warlord with lots of psykers and being great in close combat with close range dakka.
* '''Legion of the Damned''' - They might have some good armor, but don't trust on them to be there for you unless you made them warlord and rolled Never Too Late, Never Too Early.  Don't forget to nab another ally, though.
* '''Space Marines''' - Can take quite a few locator beacons to drop your guys where you want.  A few drop pods and a scout bike squad can keep the enemy penned up and ready for the scions to drop in.
* '''Space Wolves''' - Grey Hunters, Thunderwolf Cavalry, Long Fangs and Wolf Guards? Oh my, the Wolf chapter have a lot of options to take indeed. Their flyers are a really helpful way to deliver more forces to the field with the massive capacity of the Stormwolf or the devastating power of the Stormfang.  They're also capable of bringing some big firepower if you opt to take all the free Lone Wolves you can get.

'''Allies of Convenience'''
* '''Eldar''' - A Psyker-heavy army. There's nothing the Eldar can bring in this respect that the Inquisition can't do better while being able to make the most of Allied Transports '''and''' ally at the Battle Brothers level. <s>(Powerful jetbikes? or even any bikes for that matter?)</s> Once again, Battle Brothers do it better. Ally in Ravenwing and/or White Scars. 

'''Desperate Allies'''
* '''Dark Eldar''' - Why not? Tactically, the Scions play very like Dark Eldar: get go fast, hit hard and die easily. The Dark Eldar could either be used to bring some punch to a deep striking army (with webway portal and/or deep striking vehicles), or to give some more mobile firepower to your army (Ravagers are better than Tauroxes). The thing is, a lot of good Dark Eldar builds these days revolve around Haemonculi who don't go that well with Scions except as bullet-soakers and psychic defence (with the new artefact).
* '''Tau''' - If all else fails, you can mix the heavier and longer ranged weapons of the Tau to take on Vehicles and heavy targets while the scions would take the lighter targets that are coming at the gun lines. Definitely a pretty nice combination if you deep strike scions before an oncoming horde.

'''Come the Apocalypse'''
* '''Necrons''' - Pretty good: with your special formation and AirCron tactics, you can totally overload the board in Flyers. Could be fun! 
* '''Chaos Space Marines''' - Well... I'm sure there is some reason to do this. Maybe to provide a distraction while Maulerfiends run up the field?  
* '''Chaos Daemons''' - More deepstriking units to a deepstriking army, no thanks. Although some Khorne units for assaults. Or some nurgle units to soak up the heavy fire. (Cough, Beasts of <strike>Nurgle</strike> Hugs and magic!)
* '''Orks''' - Because Orks.
* '''Tyranids''' - Nope. They bring nothing to MT that someone else wouldn't do better, and MT doesn't bring anything that Tyranids couldn't do better(AP3?).