On November 11, 2010, InstantAction was shut down along with all the games it hosted, including Legions. Before this, a dedicated group of community members had been working on a stand-alone client, and are still planning to release it sometime soon. The game, now named Legions: Overdrive, can be found at LegionsOverdrive.com.
11/15/2010: Legions can now be found at LegionsOverdrive.com
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