015 World of Warcraft - One Minute History

The video tutorial explores the history and major events in the World of Warcraft universe. It covers the defeat of Ragnaros and Nefarian, Leroy Jenkins' infamous actions, and the destruction of Kel'thuzad. The Burning Crusade introduces Blood Elves and Draenei, while Wrath of the Lich King sees Arthas paying for his crimes. The Cataclysm brings goblins and a subscriber milestone. Mists of Pandaria reveals a new land, and Warlords of Draenor marks a significant account milestone. Finally, the Legion returns, and Demon Hunters rise to challenge them.

What is the significance of the Death Knight's emergence?

What does the text imply about the number of accounts created in the game?