Shizune: Our records show that particular form of training has been suspended for ten years now.
Tsunade: After the Third Hoshikage came to power, he chose to put an end to it. But then, a year ago, he passed away, sadly, and the village lifted the ban.
Shizune: It's curious, isn't it? I wonder what moved him to forbid it.
Tsunade: Hard to say. Only the Village Hidden in the Stars is privy to that. Although, there have been a few rumors on the wind.
Shizune: What do you mean?
Tsunade: Well, details are spotty but most of the ninja who underwent the training, died from it.