Mass Effect 3 is getting its largest multiplayer DLC to date, BioWare announced on their blog today. The update, called "Retaliation," adds not only new character classes and weapons, but also new enemies, new modes to existing maps, and a challenge feature, with a whole host of unlockables to earn.

"Retaliation," like the game's other multiplayer DLC, is free and will be available next Tuesday, October 9.

Mass Effect 3: Retaliation Multiplayer DLC [BioWare blog]