Blizzard Entertainment announced today that Hearthstone‘s next expansion, Kobolds & Catacombs, will launch December 7. The free-to-play digital card game is available for PC and mobile.

Hearthstone has been a big hit since launching in 2014, and a constant stream of expansions have kept money rolling in as players spend cash on card packs. It is the leader of a market that research firmĀ SuperData estimates will hit $1.4 billion this year. Kobolds & Catacombs adds 135 new cards, including a Legendary weapon for each of the nine classes.

Kobolds & Catacombs also includes Spelltones, a new kind of Spell that becomes more powerful in your hand if you meet certain requirements. The expansion adds the Recruit keyword, which will summon minions from deck.

Even if you don’t spend any money on the new set, you’ll have access to Dungeon Runs. This new single-player mode has you playing against computer-controlled bosses as you slowly strengthen your deck. If you die, you have to start from the beginning. Beating it with every class will get you a special card back.