Apparently hearthstones (and the teleport) is a real thing in the Warcraft universe.

I always thought that hearthstones were simply a game mechanic that was necessary for the MMO, but not actually a thing in the actual Warcraft canon or in-game universe. Like talent respeccing or unlearning professions.Until I read an official World of Warcraft novel (Before the Storm) where Anduin Wrynn uses his hearthstone to get back to Stormwind.Anyone else not know this? What else is an actual thing in the canon and not just game mechanics?