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The DLC offers players up a new quest and character (named Sebastian Vael) with its roots deeply seeded in a revenge plot. If you decide to skip the upgraded version, the downloadable content will be available for $7 (560MS Points) following the Dragon Age 2's release.
In October, when BioWare revealed the "Signature Edition" upgrade offer, the dev promised it would include $20 worth of additional content. According to EA's store page, the edition also brings with it four bonus weapons and a digital copy of the game's official soundtrack. Dragon Age 2 will also offer new game purchasers with additional content, much like the Cerberus Network did with Mass Effect 2.