Sasuke's Mangekyo [Part 2]

In the Hokage stands:

The Fourth Raikage had already rushed to the edge of the railing. He stared at Naruto in shock, then turned to Yuya and asked in a deep voice, "That is... Sage Mode?!"

Yuya smiled faintly and nodded.

Ōnoki sharply drew in a breath.

Mei Terumi and Rasa looked at the two of them. Mei Terumi could not help asking, "Sage Mode... what is that?"

The Fourth Raikage shook his head. "I do not know the specifics. I only heard my father mention it, and my father heard about it from his teacher—the First Raikage."

As he spoke, the Fourth Raikage looked at Ōnoki. "But there is an old man here who has been alive since the founding of the shinobi villages. He definitely knows."

Ōnoki snorted. "Sage Mode is a chakra mode that allows one to commune with natural energy. In this mode, all kinds of ninjutsu receive a tremendous boost in power. Though the enhancement is only temporary, its effect is extremely impressive."

The Fourth Raikage rubbed his chin and said, "That sounds rather like the chakra mode in our Kumogakure."

Ōnoki was speechless. "Your Kumogakure can only enhance physical abilities. What they can enhance is far more than just physical ability."

The Fourth Raikage snorted, then thought for a moment before asking Ōnoki, "In this mode, can someone survive after their heart is destroyed?"

Ōnoki was even more speechless. "No normal person could possibly survive that."

The Fourth Raikage nodded, then seemed to think of something as his expression turned grave. "What if... there were a whole unit of Sage Mode ninja..."

"That is impossible." Ōnoki rolled his eyes. "I do not know the specific terms of Konoha's contract with Mount Myoboku, but the First Hokage once said that each generation of the sage