Hunter x Hunter: The Last Mission (2013)

Chairman Isaac Netero of the Hunter Association faces a formidable challenge as he confronts the re-emergence of On users at the prestigious "Battle Olympia" tournament in Heaven's Arena. Years ago, he sealed away Jed, a powerful Hunter adept in this dark form of Nen. Now, with a looming threat fueled by vengeance and hatred, Netero embarks on what could be his final mission. To safeguard both the Association and humanity, he will require every ounce of strength and assistance available to him in this perilous fight.