Diablo III: Collector's Edition Five new character classes, including the otherworldly Witch Doctor, or with re-imagined warriors from Diablo's past, like the powerful Barbarian Experience a new approach to in-game health as the previous reliance on mana and potions is appended by resource types unique to each class, as well as health globes In single player quests utilize up to three AI followers, from three different classes who can be equiped with basic items and leveled up The new Rune System in which skills and abilities are now automatically unlocked as you level This special collector's edition contains exclusive physical and digital content including a 'behind the scenes' DVD, a Diablo Skull and 4 GB USB Soulstone, art book, soundtrack and more