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The expansion has players claim the Lich King's Frozen Throne by traveling to Northend and attacking the Icecrown Citadel.It introduces 135 new cards to the game and nine legendary Hero Cards that, after being played, transform the game's heroes into Death Knights. A new power called Lifesteal will also be featured, which heals players for the amount of damage they've dealt. Knights of the Frozen Throne also brings with it eight free missions which allow players to explore the Icecrown Citadel and engage in various boss battles, including a showdown with the Lich King himself.Players can pre-purchase 50-pack bundles, limited to one per account, for a one-time price of $49.99.For more on Knights of the Frozen Throne, here's an overview of everything Blizzard told us about Knights of the Frozen Throne . Also be sure to check out one of the new cards , a Priest legendary called Archbishop Benedictus.

Alex Gilyadov is a freelance writer for IGN. You can follow him on Twitter.