Planetary Annihilation Legion Expansion

Created by the Progenitors in the dying days of the Pro-Com war, the Legion represented humanity’s last ditch effort to defeat the Machine Liberation Army (MLA). It failed. When the superweapon was unleashed which disabled the MLA the Legion were not spared. Millennia later they have awoken and seek to win the unwinnable war for which they were created, in memory of their creators.

A labour of love put together over the course of one-and-a-half years, the Legion Expansion introduces over a hundred new units to form an entirely new faction equal in size and scope of the original. You can use it in multiplayer, or play against the AI in skirmish; both are fully supported.

The Legion lack the mobility and numbers of the MLA, instead their focus is on raw power. While the enemy are many, the Legion’s armour is strong and their guns powerful. They do not focus on early raiding or rapid expansion, rather they prepare themselves to strike a single mighty blow that both begins and ends the battle.

There is a press kit available.


You will need to have enabled Community Mods.

The Legion Expansion is installed from the Community Mods section of Planetary Annihilation. Simply search for “Legion” in the top-left search box on the Available tab and choose to install the Legion Expansion. All required elements will be installed. AI support is included within the mod for skirmish play, but for enhanced AI try installing the Queller AI as well.

Hosting and Joining

Ensure the mod is enabled in Community Mods. This will occur automatically when you install it.

Each time you host a multiplayer Legion Expansion game, PA will upload the server mod to the Playfab server, please be patient while this occurs. The speed at which this occurs depends on your upload bandwidth. See a site such as to check this.

Legion Expansion games are marked on the lobby browser with a red Legion tag so long as you have the Legion Expansion enabled.

You play as the Legion by selecting a red Legion Commander in the lobby.

Legion Expansion Overview

Playing against the Machine Liberation Army, you’ll often find yourself facing down never-ending swarms of units. Even with some of the most powerful units at your disposal, it can be easy to be overrun by the sheer number of enemy forces.

Each Legion unit has strengths and weaknesses. Experiment with new and different unit combinations to find powerful synergies where your units support each other and become a much deadlier force as a whole. Use every tool and ounce of cleverness at your disposal. Whether it’s scouting with hidden Investigators, jumping over obstacles with Purger boombots, forming strong points with Rampart shield generators, or surgically inserting your forces with flying Comet teleporters to do crippling damage.

A typical game against the MLA will flow something like this:

  • Early game: Defend against MLA mobility advantage
  • Mid-game: Push out with advantage of strong units – defender attacker roles flipped
  • Late game: Advantages and disadvantages normalize as both factions develop to full capacity

Early game

All that heavy armour and weapons means you’re not as mobile as the MLA, which means they will have an expansion advantage. Defend your expansions and stabilize your economy. Make use of the very cheap Jackal light laser turret to ward off small numbers of raiding units.

At the same time, you can still surprise the MLA with a taste of their own medicine. The Marauder gunship is superb for picking off unguarded fabricators, the Stoke can clean up undefended metal extractors, and at sea the Catfish is great for scouting and exerting pressure.

During this phase you should focus on building up your troop numbers.


While still outnumbered, your units will be very strong when grouped together to concentrate their firepower against the enemy. With a focus on quality over quantity, you can start to push out and outright threaten the MLA forces with a quick defeat if they are unable to organize sufficient defense.

Late game

Your forces should be supplemented with T2 troops now. Whether you pick T2 bots or vehicles will depend on the playstyle you enjoy – both have their strengths and weaknesses. If you have air dominance, consider roasting large groups of enemies with the Salamander heavy bomber.

Unit Roster

The full stats of all units are available via PA Lobby. You can keep track of any changes via the release notes.


The Xziphid war was won by the Commanders, intelligent machines created to carry out the bidding of the Progenitors. In the aftermath a number of them broke away, forming the MLA. They took the fight to their former masters and started the Pro-Com war.

Though powerful, the Progenitors could not defeat their own creations. During the peak of the war a new generation of Commander was created, programmed to be be utterly loyal and devoted to their masters and without mercy for the foe. The Legion was born. They had access to the greatest of the Progenitor’s creations, and so for a time the tide seemed to have turned.

But war is won by logistics, and the MLA had spread too far, harvested too much. The Legion fought well but despite many glorious victories in battle they were losing. It was at this point that the Progenitors unleashed their weapon of last resort: a superweapon designed to take out all of their machine creations. The Pro-Com war was over and for millennia the galaxy was quiet.

Then something disturbed the peace and the Legion awoke to find their creators gone, but the hated foe still present. So the Legion marches once more to war, in memory of the creators they still love dearly.


This project is not the work of one, but of a legion.

nicb1 Project Lead / Models
Crembels Concept Artist
KillerKiwiJuice Models / Textures / Code / Effects
mgmetal13 Textures
zx0 Textures
Alpha2546 Effects / Balance
PRoeleert UI
wondible Code
mikeyh Code
Quitch AI / Media
Stuart98 Code / Strategic Icons
dom314 Effects
CptConundrum UI
Elodea Balance Lead / Effects / Media
AndreasG Balance Lead
Clopse Balance
Graushwein Balance
N30N Playtester
Qzipco Playtester
WPMarshall Playtester
xankar Playtester

Known Issues

  1. You must install hotbuild2 to use hotkeys – you can only bind them while in a Legion game.
  2. The Starcannon will cause a crash if you launch units into unpathable CSG such as mountains – we have disabled it for the AI.


Legion Expansion is dual licensed under Creative Commons Attribution 4.0 International License and MIT for software portions containing JavaScript code.


Does this work with Planetary Annihilation Classic?

No, the Legion Expansion requires Planetary Annihilation TITANS 94243 or later to work.

Does every player in a lobby need Legion Expansion installed?

No, players will receive all the files they need upon joining a lobby. We still recommend that you install the mod in advance though to speed up the joining process.

Why do lobbies take longer to load?

Whenever you host a multiplayer lobby you need to upload the mod to the server. The speed at which this happens will depend on your available upload bandwidth.

If you join another player’s Legion lobby then you may need to download the mod from the server. The speed at which this happens will depend on your available download bandwidth.

We’ve done our best to optimize the mod to minimize the time it takes to host and join lobbies.

How do I play as the Legion?

You select one of the red Legion Commanders in the lobby.

Why doesn’t the Commander have a build bar?

You have another mod installed which adds units. Due to the way PA handles unit additions this is causing a conflict with Legion. You need to disable the other mod.

How do I turn off the red theme?

In Settings at the bottom of the Gameplay section is an option to disable the Legion UI.

Does it work with Galactic War?

Owing to the lack of server mod support within Galactic War, it is not possible to use the Legion faction in this mode yet.

Does it have AI support?

Yes, you can play against the AI in skirmish or multiplayer.

Can I make the AI more difficult?

The built-in AI is designed to play using the same style as Uber Entertainment’s AI for the MLA. For a greater challenge check out the Queller AI mod.

Does hotbuild2 work with Legion Expansion?

Yes, though you will need to load into a Legion Expansion game to be able to access the units in the hotbuild2 settings.

Where can I find unit stats for Legion?

All the unit stats are available at PA Lobby.

Unit X is totally OP!

It’s important to remember that the Legion has its own style; that means new tactics and new counters. Make sure to spend time getting to know the faction and don’t be afraid to experiment. We had some of the best Planetary Annihilation players put this faction through its paces. But if it seems like we really did miss something, well then come and discuss if over in the Legion thread.

I found a bug, who do I tell?

Raise a ticket on GitHub. Please be sure to check whether a bug already exists for your issue and that you’re not running any incompatible software. If not then create a new issue and include as much information as possible, including steps to reproduce the bug and any relevant logs and game lobby IDs.

Report any crashes experienced while playing with Legion:

Published: 2nd May, 2016

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