Follow Jaina Proudmoore’s journey from scholar to mighty Mage in Hearthstone Book of Heroes, an all-new solo experience! Hearthstone Book of Heroes will bring fresh and FREE single player content over the course of the next 12 months, until the stories for all 10 core Heroes have been told. Defeating all 8 bosses in this linear adventure will reward 1 Mage Pack, containing only Mage cards from Standard!