Mass Effect™ 3: Retaliation Multiplayer Expansion

Harbinger's Black Arks have arrived! Mass Effect 3: Retaliation unleashes the Collectors against the allied forces, adding an all-new fourth faction to battle. Cerberus Dragoons and Geth Bombers reinforce their troops, and the allies fight back with new weapons, mods, kits, and ammo types. Six firebases are now swept by hazards as well as enemies!