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One Night in Karazhan is Hearthstone's fourth adventure. The adventure features 13 bosses, spread across four wings (plus a free introductory encounter), as well as a more challenging Heroic mode, and 9 Class Challenges. The adventure features 45 new collectible cards, as well as a new battlefield and 2 new card backs. One Night in Karazhan sees players return to the reimagined glory days of the ...