Yesterday, Blizzard released the first expansion to the game, called Curse of Naxxramas. The expansion is divided into five wings: Arachnid Quarter, Plague Quarter, Military Quarter, Contruct Quarter, and Frostwyrm Lair. Each wing will be released on a weekly schedule.
Within the next 30 days, players can unlock the first wing for free. After the month-long Naxxramas launch event, the Arachnid Quarter alongside the other wings will be available as paid expansions. Each wing costs 700 in-app golds or $6.99 in-app purchase.
Curse of Naxxramas brings 30 new cards that you can add to your decks. These cards can only be obtained by completing quests in the Naxxramas adventure. They cannot be found in booster packs, cannot be crafted, and cannot be disenchanted either. But once you've unlocked the cards, you can craft their gold versions.
The Arachnid Quarter
Arachnid Quarter is the first wing in the Curse of Naxxramas expansion. Arachnid along with the other wings are located in the Solo Adventures menu. Each wing has three game modes: Normal, Class Challenge, and Heroic. Players need to complete the Normal mode to unlock the other two modes.
In Arachnid Quarter, you will face three bosses: Anub'Rekhan, Grand Widow Faerlina, and Maexxna. You can use any deck that you have to face them. And, here are their Hero Powers:
Anub'Rekhan: (2) Summon a 3/1 Nerubian.
Grand Widow Faerlina: (2) Fire a missile for each card in your opponent's hand.
Maexxna: (2) Return a random enemy minion to your opponent's hand.
Each boss has a specific reward card that you can unlock when you beat them. You can then use that card to modify your deck before the next battle. And if you manage to beat Maexxna, you will also get her Legendary card. All Naxxramas cards are legal for constructed play.