This is one of the many expansion packs that Mass Effect 2 has recieved and will be recieving. Mass Effect 2 has had two DLC packs before this- Overload and Aegis Pack. You can download these to enjoy more Achievements, arenas, weapons and armours.

SPOILER WARNING

“Two years ago, Commander Shepard died and Liara T’Soni fought in a desperate struggle against the Shadow Broker to recover her former Commander. Now that Shepard is back, it’s time to even the score,’ says BioWare in an attempt to describe what the new expansion pack is all about. “Team up with Liara and confront the mysterious and sinister Shadow Broker in the latest expansion to Mass Effect 2, coming soon.”

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Mass Effect 2 was released earlier this year on the Xbox 360 and the PC to wide critical acclaim. It got a 10/10 here on GamingBolt. Hit the link above to read its review.