The BioWare Blog announces the Leviathan DLC for Mass Effect 3 that was previously uncovered for the action/RPG sequel, as well as plans for a new Firefight weapons pack for the game. The Leviathan pack is a story-driven single-player campaign expected later this summer, and the Firefight pack is due next week. Here's word on both:

Taking place during the events of Mass Effect 3, players will be thrust into the darkest corners of space where they will hunt a mysterious being rumored to be powerful enough to destroy a Reaper. As they race against time, they will begin to unravel the secret of the Leviathan. Explore uncharted systems and new areas on the Citadel, interact with brand new characters, unlock the AT-12 Raider shotgun and M-55 Argus Assault Rifle and discover more about the mysterious history of the Reapers. Available on PC, Xbox 360 and Playstation 3. Cost is $10 or 800 Microsoft points.

Firefight Weapons Pack

But that is not all. Players will soon be able to arm themselves with the Firefight Pack, a new Single Player Weapon Pack available for download August 7. Available on PC, Xbox 360 and Playstation 3. Cost is $2 or 160 Microsoft points. The Firefight Pack will feature two powerful new weapons and five bonus weapons to use in the fight to Take Back Earth!