The next Hearthstone expansion has been announced! It’s called “Kobolds & Catacombs” and the highlighted features include: new Spellstone cards, 135 added cards in total, nine new class-specific Legendary Weapons, and a free new single-player game mode called “Dungeon Runs.”

Here’s the official rundown of what the expansion will add to the game:

Pesky Kobolds have been tunneling beneath Azeroth for thousands of years, uncovering and hoarding artifacts long forgotten by mortals and surface dwellers . . . but whispers of these mighty treasures ripe for the taking have begun to spread throughout taverns far and wide. Some of the most alluring rumors speak of powerful Spellstones among the 135 cards included in Kobolds & Catacombs: enchanted items that you hold in your hand to empower before playing. Intrepid adventurers will also be able to arm themselves with one of nine new class-specific Legendary Weapons! Players will receive one free Legendary Weapon the first time they log in to Hearthstone after Kobolds & Catacombs has launched.

The bravest and most foolhardy adventurers will need all the help they can get as they delve into Hearthstone’s free new single-player game mode: Dungeon Runs! Coming with the launch of Kobolds & Catacombs, Dungeon Runs will send Hearthstone players on challenging, high-stakes subterranean adventures inspired by the classic fantasy dungeon crawl. Players start with a novice deck from their class of choice and face a series of progressively stronger foes, randomly selected from a huge pool of unique bosses. As they progress, they’ll bolster their decks with cards looted from defeated bosses, including some immensely powerful treasures exclusive to Dungeon Runs. Heroes should plunder with caution, however, because losing a single battle will spell the end of their Dungeon Run.

Kobolds & Catacombs has a launch window of sometime in December, but nothing concrete just yet. Price-wise, players can now pre-purchase new packs in a 50-pack bundle for a one-time price of $49.99. Those who pre-purchase will be granted a “sparkling, jewel-encrusted “For the Hoard!” card back for free.

In other Blizzard news, StarCraft II is going free-to-play, a new Overwatch hero has been revealed along with a new map, and Blizzard talks Overwatch eSports tools and updates.