Editing Warhammer 40,000/Tactics/Tyrant's Legion(7E) (section)

==Allies==
In a strange decision that seems to fly in the face of all other armies' ally choices, Forgeworld decided that the Tyrant's legion pissed everyone off so much that they can ONLY take Imperial Guard or Codex: Space Marines as Allies of Convenience. Nothing else... No desperate allies and certainly no battle brothers. ''The strong are strongest alone!''

Though it does make Ally decisions quite easy since you will UNDOUBTEDLY have spare models for at least one of these forces lying around.
*Allying with Space Marines is probably a poor decision unless you have something in particular in mind. Since you can pull most of the useful units over into your main force already without having to pay the HQ / 2-Troops tax. Though if you are looking for some fast attack and mobility to add to your army, it is certainly an option since your own Fast Attack are balls.
**Also you get to further customise your Space Marine ally with Chapter tactics, letting you tailor your force to pick up some slack. White Scars in particular do exceedingly well here. ''(Remember that Mantis Warriors fought alongside Huron, and they were White Scar successors)''
*Your other choice is Imperial Guard, which allows you do spam MORE Leman Russes or Artillery. Give you MORE large units of BETTER infantry, and thankfully comes with BETTER options for aircraft in the form of Valkyries / Vendettas. Though taking this option may make you question why you are playing Tyrant's legion in the first place. ''(Space Marines in the army remember?)''
**Imperial Guard Armored Company is definitely worth a mention, since Vehicles units cannot be joined by characters and Tyrant's Legion have no real rules that carry over to them either, essentially bypassing the downside of allies of convenience. You can take 2 Leman Russ tanks as the minimum required 1 HQ and 1 Troop choices in this list, or go all out and take up to 8 Leman Russes and a squadron of Vendettas along with some heavy support goodness (artillery, etc). Plus the HQ and Commisar Elite choice tanks have BS 4 (Could proxy this as being crewed by Speess Muhreens). This leaves you with more space in the main list for Legion Support Choices or aircraft.
*Your Third Choice is to not ally at all. Since you don't have battle brothers, there is no way to create funky combos by adding independent characters or sharing special rules or granting blessings through psykers. You could just play the army as it was meant to be played, and save those points for more infantry or tank saturation.
* Your fourth option is to not actually play the pretty crappy TL list and instead play vanilla marines with guard allies (or vice versa). Clearly this loses all the fluff points but it makes for a radically more competitive army. If you've put together this army then it may pain you to forgo your special army list but if you're playing against more competitive lists this option at least ensures you'll get a reasonably good game. When you're playing for fun/fluff then play the legion list, when you're playing to win then it easily transfers into a more competitive list. 
** Also worth noting that in a friendly game most people will be cool to house rule the TL list to make it more competitive and while that's not really the purpose of this article you really aren't playing the TL for srsbsns games so, well at least it's worth mentioning.
* Oh and you could just go Unbound which might or might not be useful but that is the thing you can do.