Extracting

Sky ninja base.

From the outside, it looked like a massive ruin.

But in truth, this cluster of buildings was merely the upper half of Ancor Vantian, the Sky ninja's Flying Fortress.

This Flying Fortress was the Sky ninja's last hope.

Unfortunately, although all the facilities within the Sky ninja fortress remained intact, its most crucial power system was missing.

As a result, this enormous fortress could only remain buried within this forest.

Shinnō had never abandoned his dream of reviving the Sky ninja.

He had worked toward it all these years.

Back then, the Sky ninja had mobilized the resources of their entire nation and spent decades constructing the Ultimate Destructive Weapon, Ancor Vantian.

Ancor Vantian meant Royal Fortress.

As long as they developed Ancor Vantian's energy system—the Artificial Tailed Beast, Zero-Tails—

They would be able to conquer the entire Shinobi World.

The reason the Sky ninja harbored such enormous ambitions was that Zero-Tails could absorb all the darkness within people's hearts and turn it into energy.

This energy could power the Aerial Fortress, Ancor Vantian, and it could also strengthen the human body.

In a Shinobi World where flight was rare, Ancor Vantian was nearly invincible.

Once war began, dark energy would be virtually inexhaustible, and the Sky ninja's ambitions could be fully realized.

However, while the Sky ninja were still creating the Artificial Tailed Beast Zero-Tails, their ability to fly attracted Konoha's attention.

To eliminate future trouble, Konoha launched a direct surprise attack on the Sky ninja, wiping out their village.

At the time, the Sky Ninja Village had yet to develop Zero-Tails. Their upper-level combat strength was no match for Konoha's, so they could only flee.

Fortunately, Shinnō took Zero-Tails' core with him. After more than ten years, he finally found the Scroll of Zero-Tails Revival