Blizzard announced freshly, its game Hearthstone, had garnered more than 50 million registered users worldwide.

Mike Morhaime, CEO and co-founder of Blizzard Entertainment, in a press released said: “Whispers of the Old Gods adds an exciting new set of creepy, corrupted cards to Hearthstone. We can’t wait to see how creative players are with the ancient evil of the Old Gods in their hands.”

C’Thun is especially eager to lend its awesome power to denizens of the tavern—players will receive this legendary Old God and two Beckoner of Evil cards when they open their first Whispers of the Old Gods card pack. Also, in celebration of the launch, everyone who logs in to Hearthstone will receive three Whispers of the Old Gods card packs free (for a limited time).

Whispers of the Old Gods is available now for Windows and Mac PCs, iOS and Android tablets, and mobile phones. Card packs can be purchased individually or in discounted bundles from the in-game Shop for gold or real-world currency (same pricing as all other Hearthstone: Heroes of Warcraft card packs). Players now also have the chance to win Whispers of the Old Gods card packs as quest rewards, or prizes in the Arena, and can also craft cards from the expansion by using Arcane Dust, which is collected from disenchanting unwanted cards.