The second wing of Hearthstone's Blackrock Mountain - Molten Core - is now available.
The second of five wings, each releasing weekly, offers up three opponents to face off against: Garr, Baron Geddon and Majordomo Executus. Win again all three, and you earn the Legendary Majordomo Executus card.
As with Blackrock Depths, there's a Heroic mode unlocked after normal mode's been completed, along with two class challenges. Check out full details on the official page.