Blizzard has announced Hearthstone: Goblins vs. Gnomes, the first full expansion for its popular digital collectible card game.

Goblins vs. Gnomes will dive into the deep engineering rivalry between the two races. It will introduce more than 120 goblin- and gnome-themed cards.

“Though wildly brilliant, these pint-size tinkerers don’t always have the upper hand on the mechanical contraptions they create, and the results can be wonderfully unpredictable,” said Blizzard. “The new cards coming in the expansion are filled with wild and wacky inventions as well as some faces that will be familiar to World of Warcraft and Hearthstone players.”

Goblins vs. Gnomes will be released this December. Card packs will be winnable in Arena mode, and purchasable with in-game gold, or real money. Final dates will be confirmed in the weeks ahead, said Blizzard.

In other Hearthstone news, Blizzard also confirmed that the game is coming to Android this December.