Faction Pack , the new story based add-on content for Metro: Last Light is now available. This pack features three new single-player missions, with each mission focusing on a different faction from the game. So you'll be on the side of the Red Line, the Reich, and the Polis Rangers.
This is the first of four piece of add-on content. The next packs will give you a challenge based mode with online leaderboards. After that is the pack featuring a shooting gallery, AI arena, Metro Museum, and a new solo mission. The last DLC will feature original single-player missions that will have you exploring the side-stories of Pavel, Khan, and Anna.
The Faction Pack is going for $4.99 on the PC, Xbox 360, and PlayStation 3. Grabbing the season pass will net you all this for $14.99, saving you $5 if the rest of the packs are priced the same as Faction.
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via destructoid http://www.destructoid.com/metro-last-light-s-first-downloadable-content-is-now-out-258286.phtml