Set in the bustling, lawless port city of Gadgetzan, the expansion features characters from the city's three ruling crime families - the brutish Grimy Goons, the shadowy assassins of the Jade Lotus, and the crazed spellcasters of the Kabal. With their own minions, spells and weapons, each family is formed from an allegiance of three different Hearthstone classes, resulting in tri-class cards, usable by heroes of any of those three classes.