Blackrock Mountain is the second Hearthstone Adventure. It consists of five wings where players battle against characters from the Warcraft universe. First of the five wings was released on April 3rd 2015.  All five wings were available on May 1, 2015. 
Blackrock Mountain Solo Adventure consists of five different wings that can be purchased for either 700 gold each or with real money. Defeating the opponents in a single wing also opens Class Challenges for that part of the Adventure.
|Coren Direbrew||Grim Patron|
|High Justice Grimstone||Gang Up|
|Garr||Druid of the Flame|
|Baron Geddon||Blackwing Technician|
|Majordomo Executus||Imp Gang Boss|
Defeating all the opponents in Molten Core is rewarded with a legendary card Majordomo Executus.
|Highlord Omokk||Core Rager|
|General Drakkisath||Dragon Consort|
|Rend Blackhand||Dragon Egg|
Reward for defeating all the opponents of Blackrock Spire is a legendary card Rend Blackhand.
|Razorgore the Untamed||Revenge|
|Vaelastrasz the Corrupt||Flamewaker|
|Lord Victor Nefarius||Fireguard Destroyer|
Completing the Blackwing Lair awards players with a legendary card Chromaggus.
The Hidden Laboratory
|Omnotron Defense System||Volcanic Drake|
Reward for completing The Hidden Laboratory is a legendary card Nefarian.
Class Challenges are unlocked two at the time by defeating each wing. In the Class Challenges players battle the opponents from the Blackrock Mountain Adventure using special pre-made decks. Players can unlock a card for each class by beating their respective Class Challenges.
|Hunter||Coren Direbrew||Quick Shot|
|Mage||High Justice Grimstone||Dragon's Breath|
|Shaman||Baron Geddon||Lava Shock|
|Priest||General Drakkisath||Twilight Whelp|
|Druid||Rend Blackhand||Volcanic Lumberer|
|Warlock||Razorgore the Untamed||Demonwrath|
|Rogue||Vaelastrasz the Corrupt||Dark Iron Skulker|
|Paladin||Omnotron Defense System||Solemn Vigil|
Blackrock Mountain added a total of 31 new cards. Blackrock Mountain is the first time subtype Dragon has synergy cards such as Rend Blackhand. However the Dragon synergy cards are different to other subtypes such as Pirate or Murloc as the effects are often activated by having a Dragon card in hand rather than in play.
List of Blackrock Mountain Cards
|Axe Flinger||Common||Warrior||4||2||5||Whenever this minion takes damage, deal 2 damage to the enemy hero.|
|Blackwing Corruptor||Common||Neutral||5||5||4||Battlecry: If you're holding a Dragon, deal 3 damage.|
|Blackwing Technician||Common||Neutral||3||2||4||Battlecry: If you're holding a Dragon, gain +1/+1.|
|Chromaggus||Legendary||Neutral||8||6||8||Whenever you draw a card, put another copy into your hand.|
|Core Rager||Rare||Hunter||4||4||4||Battlecry: If your hand is empty, gain +3/+3.|
|Dark Iron Skulker||Rare||Rogue||5||4||3||Battlecry: Deal 2 damage to all undamaged enemy minions.|
|Demonwrath||Rare||Warlock||3||Deal 2 damage to all non-Demon minions.|
|Dragon Consort||Rare||Paladin||5||5||5||Battlecry: The next Dragon you play costs (2) less.|
|Dragon Egg||Rare||Neutral||1||0||2||Whenever this minion takes damage, summon a 2/1 Whelp.|
|Dragon's Breath||Common||Mage||5||Deals 4 damage. Costs (1) less for each minion that died this turn.|
|Dragonkin Sorcerer||Common||Neutral||4||3||5||Whenever you target this minion with a spell, gain +1/+1.|
|Drakonid Crusher||Common||Neutral||6||6||6||Battlecry: If your opponent has 15 or less Health, gain +3/+3.|
|Druid of the Flame||Common||Druid||3||2||2||Choose One - Transform into a 5/2 minion; or a 2/5 minion.|
|Emperor Thaurissan||Legendary||Neutral||6||5||5||At the end of your turn, reduce the Cost of cards in your hand by (1).|
|Fireguard Destroyer||Common||Shaman||4||3||6||Battlecry: Gain 1-4 Attack. Overload: (1)|
|Flamewaker||Rare||Mage||3||2||4||After you cast a spell, deal 2 damage randomly split among all enemies.|
|Gang Up||Common||Rogue||2||Choose a minion. Shuffle 3 copies of it into your deck.|
|Grim Patron||Rare||Neutral||5||3||3||Whenever this minion survives damage, summon another Grim Patron.|
|Hungry Dragon||Common||Neutral||4||5||6||Battlecry: Summon a random 1-Cost minion for your opponent.|
|Imp Gang Boss||Common||Warlock||3||2||4||Whenever this minion takes damage, summon a 1/1 Imp.|
|Lava Shock||Rare||Shaman||2||Deal 2 damage. Unlock your Overloaded Mana Crystals.|
|Majordomo Executus||Legendary||Neutral||9||9||7||Deathrattle: Replace your hero with Ragnaros, the Firelord.|
|Nefarian||Legendary||Neutral||9||8||8||Battlecry: Add 2 random spells to your hand (from your opponent's class)|
|Quick Shot||Common||Hunter||2||Deal 3 damage. If your hand is empty, draw a card.|
|Rend Blackhand||Legendary||Neutral||7||8||4||Battlecry: If you're holding a Dragon, destroy a Legendary minion.|
|Resurrect||Common||Priest||2||Summon a random friendly minion that died this game.|
|Revenge||Rare||Warrior||2||Deal 1 damage to all minions. If you have 12 or less Health, deal 3 damage instead.|
|Solemn Vigil||Common||Paladin||5||Draw 2 cards. Costs (1) less for each minion that died this turn.|
|Twilight Whelp||Common||Priest||1||2||1||Battlecry: If you're holding a Dragon, gain +2 Health.|
|Volcanic Drake||Common||Neutral||6||6||4||Costs (1) less for each minion that died this turn.|
|Volcanic Lumberer||Rare||Druid||9||7||8||Taunt: Costs (1) less for each minion that died this turn.|
Blackrock Mountain introduced a new interactive board into the Board rotation.
- "Blackrock Mountain is Live – First Wing Now Open!". eu.battle.net. 2015-04-03. Retrieved 2016-05-19.
- "Blackrock Mountain: The Hidden Laboratory – Now Open". eu.battle.net. 2015-05-01. Retrieved 2016-05-19.
- . eu.battle.net. http://eu.battle.net/hearthstone/en/expansions-adventures/blackrock-mountain/. Retrieved 2016-05-19.