Hearthstone: Heroes of Warcraft is celebrating the 20th anniversary of Diablo by introducing the Dark Wanderer to the Tavern, and here is how the Hearthstone site describes it:
"The Dark Wanderer has ventured into the Tavern with mysterious purpose and presence. There's much at stake in this week's all-new Tavern Brawl — do you have the cunning and guile to unveil the Dark Wanderer's secrets?"
By defeating The Dark Wanderer you'll receive a card pack commemorating Diablo's anniversary. Will you be playing?