Biggest-ever multiplayer add-on for role-playing game Retaliation brings new enemy faction, class kits, "Hazard" version of existing maps, weapons, challenges, and upgrades.

BioWare will release the biggest downloadable content pack to date for Mass Effect 3 next week, the company has announced. The free Retaliation Pack is due out on October 9 in North America for Xbox 360, PlayStation 3, and PC. It will arrive for PS3 in Europe on October 10.

Players will have new enemies to face in Mass Effect 3 next week.

The Retaliation Pack includes a range of new offerings, the first of which is a new enemy faction that features the Collector Praetorian, Scion, Abomination, Trooper, and Captain. Additionally, it brings the new Turian Havoc Soldier and Turian Ghost Infiltration to help combat the threat.

The DLC also adds new "Hazard" versions of existing maps, which feature new environmental hazards and traps. Further, the Retaliation Pack adds new unlockable weapons like the Collector Assault Rifle, Sub-Machine Gun, and Sniper Rifle.

Lastly, the multiplayer DLC brings a new multiplayer "challenge" feature that allows gamers to track progress against one another. By completing various assignments, players can unlock titles and banners that can be displayed in-game.

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