World of Warcraft: Exploring Azeroth: The Eastern Kingdoms is an official Warcraft book by Christie Golden presenting information on the Eastern Kingdoms. Featuring Mathias Shaw and Flynn Fairwind, the book is an "ephemera book" consisting of texts, letters, notes, and "a little mystery" along with illustrations of places, people, and equipment.
For over a quarter of a century, Warcraft and World of Warcraft players have been treated to a treasure trove of artifacts, gear, weaponry, and trinkets of both awe and amusement. Now players can get an in-depth look at the items they have collected…and the fearsome powers they hold.
From the shining towers of Silvermoon to the sulfurous Blackrock Mountain to the white stone castles of Stormwind, the Eastern Kingdoms are vast and full of wonder. Every corner of the majestic isle contains countless stories, treasures, and more than a few secrets that some would prefer stay buried. Follow Spymaster Mathias Shaw and Captain Flynn Fairwind on an expedition across the Eastern Kingdoms for king and country as they chronicle its history and catalog the weapons, armor, and powers untold that are scattered across this sprawling dominion. Penned by New York Times bestselling author and Blizzard Entertainment writer Christie Golden, Exploring Azeroth: The Eastern Kingdoms is your first step on a truly remarkable journey across the beloved lands of Azeroth.
It was originally slated for a release date of October 20, 2020.
The book states that Medivh raised Moroes as an undead creature as mad as him. However, Medivh was killed soon after Moroes's death, and the resurrected Medivh was no longer mad or shown to be capable of raising dead people.
According to  Eitrigg's Wisdom, Rend and Maim ruled the Blackrock Spire, in constant conflict with the Dark Iron dwarves. They managed to displace the dwarves in the upper portions of the city, but only after the dragons came and only after the death of Maim. Exploring Azeroth states that after the Second War, a bargain was struck between the Blackrock orcs and the Dark Irons, with the dwarves descending even deeper into the mountain, while the orcs occupied the higher levels.
The passage also mentions that Blackhand must have thought the name of Blackrock Mountain had been given to the mountain in anticipation of their arrival. However, Blackhand has never been mentioned in Chronicle or previous sources in reference to Blackrock Mountain / Spire. According to Chronicle, it was the Shadow Council that controlled the spire as their secret holdout during the First War, but it is not stated if Blackhand knew about it.
The wording also seems a bit erroneous because when it says that the Blackrocks came to Blackrock Mountain after the Second War and mentions Blackhand, Blackhand was long dead when the Second War ended.
In his report on Nefarian in Blackrock Mountain, Mathias states that rumor has it that Nefarian's head was still lying about because it was too heavy for SI:7 agents to move. However,  Beginning the Descent depicted the skeletal remains (including the skull) of Nefarian being destroyed by Wrathion. Strangely, further in his report, Mathias does acknowledge the events of the quest, where heroes thwarted another resurrection attempt on the dragon siblings.
On Tirion Fordring's plaque transcript, it uses "and exemplar", whereas in the game it is spelled "an exemplar".
In his recollection of blood elf history, Shaw claims that when the Sunwell was destroyed, the blood elves replaced their addiction to the arcane magic it produced with an addiction to fel energy. This is not corroborated by the Eversong Woods storyline or accompanying lore, such as Blood of the Highborne, whose subplots on this topic focus entirely on the blood elves' addiction to arcane magic and do not suggest they were feeding on fel at all, much less addicted to it. The Ask CDev answer on the topic is also at odds with this, describing the blood elves, like the orcs before them, as having been exposed to fel energy due to livingaround it, not consuming it. It also contradicts statements in World of Warcraft: Chronicle Volume 3 and the Warcraft Encyclopedia: the former outright states that Kael'thas' addiction to fel magic was one of the main reasons his people back on Azeroth turned against him, and according to the latter, the wider population of blood elves managed their addiction to magic by draining arcane energy from objects and mana-bearing vermin, not the fel magic of demons.
^Christie Golden on Twitter (2020-07-09). Retrieved on 2020-07-10. “Not exactly, it's what they call an ephemera book. Here's the one I did for Assassin's Creed. It's texts, letters, notes, Shaw's notebook (and Flynn's comments!), and a little mystery along with illustrations of places, people, weapons, and gear!”