Makarov explains that the first Master, Mavis Vermillion, placed a (Fairy Heart) deep within the guild—an infinite magic source. But more importantly, he reveals that Zeref, the most evil mage in history, is not only alive but is the Emperor of the Alvarez Empire , which is now preparing to invade Ishgar.

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The episode opens in the immediate aftermath of Natsu’s devastating defeat of the rogue Dragon Slayer, Zirconis (a ghost from the Eclipse Plan), and the shocking death of Avatar’s master, Arlock. However, there is no celebration. The guild is somber as they return to the ruins of the Avatar hideout. The emotional core of this episode belongs to Gray Fullbuster. For the first time, he openly confesses to Natsu, Erza, Lucy, and Wendy the full truth: he infiltrated Avatar undercover, feeding information to the Magic Council. But his mission was also deeply personal. He reveals that he was trying to find any leads on END—the most powerful demon from the Book of Zeref—because he believes END killed his master, Ur.