Today during the opening ceremony of Blizzcon 2014, Blizzard Entertainment announced that a new expansion for free-to-play card game Hearthstone: Heroes of Warcraft will be released next month.

The expansion is called Goblins vs. Gnomes. It will feature 120 new cards, including one for an explosive sheep.

Hearthstone was released earlier this year. It quickly became a hit, and now has more than 20 million registered users.

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