Mount Myoboku, Ryuchi Cave, and Shikkotsu Forest are the three great holy lands of summoning beasts.
They existed before Otsutsuki Kaguya arrived in the ninja world.
Origins of the special system: sage arts.
In the original, Mount Myoboku had the most screen time.
Especially the Great Toad Sage, the ancestor of troublemaking.
It taught Otsutsuki Hagoromo, the Sage of Six Paths, sage arts.
And gave the Sage Talisman, saving his brother Otsutsuki Hamura.
The brothers fought Kaguya and sealed her.
Though the Great Toad Sage never fought, its power was unfathomable.
Plus, extremely accurate prophecy.
Jiraiya seeking the Child of Prophecy was at its behest.
In short, a behind-the-scenes mastermind.
Jiraiya walked the path lined with toad statues.
These were ninjas who failed sage mode training.
He almost became one.
Luckily, he was fortunate.
"Little Jiraiya, you're here."
A green toad in a gray robe appeared.
"Shima Boss."
Jiraiya greeted quickly.
"Follow me to see the Great Lord."
Shima Sage didn't say more, turning into the hall.
Jiraiya followed immediately.
Soon, he saw the Great Toad Sage.
Wearing a doctoral hat, orange body, necklace with beads, central gem engraved with "oil."
Huge size.
At least one pot couldn't stew it.
Of course, Jiraiya wouldn't think such blasphemy. He stood below, respectfully calling, "Great Toad Sage."
The Great Toad Sage seemed asleep, no response.
Shima Sage sighed, expected, took a deep breath, and roared, "GREAT LORD!"
Jiraiya instinctively covered his ears.
Why yell so loud?
The Great Toad Sage woke leisurely. "Who comes?"
"Fun playing this every time?"
Shima Sage spat without hesitation.
"Jiraiya."
Jiraiya didn't dare spit, answering honestly.
"Jirai-what?"
"Jiraiya!"
"What-iya?"
"Jiraiya!"
Just as Jiraiya thought the Great Toad Sage was toying with him, it nodded, as if just waking.
"Little Jiraiya, sorry, it's been so long, I almost didn't recognize you."
"It's fine."
What could Jiraiya say? Couldn't curse or fight it.
"Great Toad Sage, you called me—what is it? A new prophecy?"
He respected it for teaching sage arts and mode, and its prophecies were too accurate.
Seeing the future—who isn't a sage?
"I once told you the Child of Prophecy has incredible power, might bring peace or destruction to the ninja world, so you must guide as teacher."
The Great Toad Sage's tone unchanged. "But now, destruction outweighs peace."
"How?"
Jiraiya was shocked. "Great Toad Sage, know why?"
"Don't know."
The Great Toad Sage shook its head. "But speed up finding the Child of Prophecy."
Jiraiya smiled bitterly.
Knowing nothing, how to speed up?
The ninja world is huge; finding the Child is like a needle in a haystack.
"One more prophecy."
The Great Toad Sage opened its squinted eyes, showing rare seriousness. "I dreamed of Mount Myoboku's destruction."
"? ? ?"
Jiraiya and Shima Sage showed shock.
Mount Myoboku's history was ancient, so old they didn't know its origin.
Its location special, not in the ninja world.
Entry only via reverse summoning.
Thus, no matter the chaos, it never affected Mount Myoboku, let alone destruction.
"Great Toad Sage, is destruction what I think?"
Jiraiya asked uneasily.
"All toads will die, including me."
The Great Toad Sage puffed its pipe, smoke rings drifting in the hall.
"Great Lord, impossible?"
Shima Sage was horrified. "Even the Sage of Six Paths might not destroy Mount Myoboku—who has such power?"
"Don't know."
The Great Toad Sage shook its head.
"..."
Shima Sage and Jiraiya were speechless.
You're so good at prophecies, but can't see who kills you?
"But I have a clue."
The Great Toad Sage recalled. "He has special eyes."
"Eyes?"
Jiraiya first thought of bloodline limits.
Like Sharingan and Byakugan.
Or his temporary disciple Nagato's eyes.
But unlikely—those are the Sage of Six Paths' eyes.
"Little Jiraiya, this person is evil; find and kill him early, or Mount Myoboku ceases to exist."
Involving its safety, the Great Toad Sage wasn't calm.
"I understand, Great Toad Sage."
Jiraiya nodded gravely.
Destroying Mount Myoboku—what power?
Even if found, could he kill him?
He didn't know, but he'd complete the task even at the cost of death.
Leaving the hall, Jiraiya felt lost.
Where to start?
He stroked his chin, deciding to check the Konoha.
Not that he distrusted Uchiha or Hyuga, but special eyes—they were famous for it.
Their clans totaled thousands; maybe a bad apple.
Besides, Jiraiya wanted to see Naruto.
Busy with the prophecy, he didn't know how his grand-disciple was.
But with teacher Sarutobi Hiruzen, Jiraiya believed he'd be fine.
As Hokage, he'd treat the hero's son well.
Even as Nine-Tails jinchuriki, at most keep it secret, like Uzumaki Mito and Kushina.
Jiraiya sighed.
Poor kid, orphaned at birth.
"Shima Boss, any toads near Konoha that can reverse summon?"
Jiraiya asked.
"Yes."
Shima Sage nodded. "I'll contact it."
Soon, with smoke, Jiraiya returned to the Konoha.
….
"Boss knows me well."
Jiraiya looked around, realizing he was at Konoha Hot Springs, smiled, and rubbed his hands excitedly.
"First a soak, then find little Naruto. Hehe, beauties, I'm coming!"