Blizzard talks crafting Hearthstone’s Karazhan, Purify anger, and Arena’s future

Blizzard’s party almost crashed before it started, but communication saved the day for Hearthstone: Heroes of Warcraft’s latest adventure.

One Night in Karazhan is rolling out now. It’s a series of fights against computer-controlled opponents that come out weekly, with the final wing becoming available on September 2. Most important for fans, beating those bosses unlocks new cards. Not only do they give players something new to play with, but these adventures can introduce new strategies and techniques to the leader in the $1.2 billion digital card game market.