Hidden Laboratory is the name of the game's second expansion finale (if you will). Players who have pre-purchased all of the wings can now face new bosses like of Omnotron Defense System, Maloriak, Atramedes, and, Nefarian.
Along with five neutral cards to add to the collection, players will also take on the final class challenge for the Paladin class. Also to those interested, all of the Heroic challenges are now available. Meaning that the exclusive Blackrock Mountain card-back can be acquired.
Hearthstone is free-to-play, but players who wish to take on Blackrock Mountain will need to dish out $24.99.
