The second wing of Hearthstone's Blackrock Mountain expansion will be released on PC, Mac, and mobile devices today. The Molten Core wing provides three more single-player boss encounters to test players' skills.
Molten Core's bosses should be very familiar to anyone who completed the World of Warcraft raid of the same name. Here's a run-down of each boss and the cards you'll earn by defeating them (via Battle.net):
Hero Power: Magma Pulse (1 mana) - Deal 1 damage to all minions.
Reward: Druid of the Flame (2/2 minion, 3 mana) - Transform into a 5/2 or 2/5 minion.
Hero Power: Ignite Mana (0 mana) - Deal 5 damage to the enemy hero if they have any unspent Mana.
Reward: Blackwing Technician (2/4 minion, 3 mana) - If you're holding a Dragon, gain +1/+1.
Hero Power: The Majordomo (2 mana) - Summon a 1/3 Flamewaker Acolyte
Reward: Imp Gang Boss (2/4 minion, 3 mana) - Whenever this minion takes damage, summon a 1/1 Imp.
Defeating all three bosses in Molten Core will also earn you Majordomo Executus for your deck. He's a 9/7 minion that costs 9 mana. When he dies, your Hero becomes Ragnaros the Firelord. Ragnaros has a 2 mana Hero Power called "DIE, INSECT" that allows him to deal 8 damage to a random enemy.
Once you've cleared the wing, two Class Challenges will open up. You'll be asked to beat Garr with a specific Warrior deck and Geddon with a Shaman deck. Each Challenge will reward you with a new Rare card for that particular class:
Defeating Molten Core's three bosses also allows you to tackle the Heroic mode of the wing. Heroic mode bosses have more health than usual, more effective Hero powers, and generally better decks. We'll be updating our Blackrock Mountain guide soon with strategies for each Molten Core boss.
Blackrock Mountain will receive five wings in total. Blackrock Depths was released last Thursday The three remaining wings - Blackrock Spire, Blackwing Lair and Hidden Laboratory - will be rolled out over the next three weeks. Each wing costs 700 gold, or $6.99 USD, to download. If you purchase multiple wings at the same time for cash, the cost is about $4.99 per wing.