"Hearthstone" will feature a new adventure, "One Night In Karazhan," an additional game content that comes with 45 cards across four wings and 13 bosses. Wings will be released once per week starting on its second week. Moreover, the first prologue mission will be available to everyone for free.

The upcoming "Hearthstone" content addition will introduce a new single-player experience released in weekly episodes. Every Thursday, players who have paid admission will get a new slew of mini-bosses that, if defeated, will grant award cards.

The new "Hearthstone" story follows a magical party thrown by a young Medivh who has enchanted everything in his tower to liven up the party, but then went missing. The game will require the player who came early in the story to find him and save the party while avoiding the magical items littered around the area. The prologue mission, on the other hand, will require the user to play the Medivh himself and will acquire Enchanted Raven (Druid) and Firelands Portal (Mage) cards, Shack News reported.

The four wings consist of the prologue wing which is free to all and will explain what happened to Medivh before the adventure begins and why he has gone missing. The first main wing is the Parlor where the player will face off against a Silverware Golem while the second wing is the opera wing where showmaster Barnes will ask the player to run a number of plays for him.

Then comes the menagerie wing where Medivh's Curator has decided to let the wizard's monsters to fly and free instead of keeping them in cages. Finally, the fourth wing is Medivh's private quarters that will feature Netherspite and the Shade of Aran where a showdown is expected, PCGames N reported.

"Hearthstone's" new content is now available since Aug. 11 that will come with the prologue and first wing. Players can buy the entire adventure for $20 or each wing for $7 or 700 in-game gold. Buying the entire adventure within the first week will grant a special cardback, reportedly.