As the eyes of the Apocalypse Organization left in Lingyun Mountain, Ge Pin's eyes were firmly fixed on the direction where the medicine capital was.

Ever since he discovered that the cyborg side had actually let the bronze-level zombies start fighting each other in an effort to transform into silver-level zombies, he had stood quietly in the observation post to see what those robots were going to do.

And at this moment, Hikaru Takada, who was dispatched by the Central Security Zone, also seems to have returned to calm.

After he learned that there were more than 400 bronze-level zombies and were preparing to evolve into silver-level zombies, the expression on his face did not change at all.

This is probably the so-called lice do not worry.

Whether it is more than 400 bronze-level zombies, or nearly 20 silver-level zombies transformed from more than 400 bronze-level zombies, there is no difference in the destructive power caused.

With the passage of time, Ge Pin and Hikaru Takada, who were standing on the observation post, both witnessed the whole process of transforming bronze-level zombies into silver-level zombies.

When the last 17 silver-level zombies of different shapes stood in the center of the medicine capital city, in the area where the original iron cage was located, they no longer had any psychological fluctuations.

However, the next scene made the two of them, who were already like old monks, widen their eyes again.

The robots stationed in the medicine capital actually controlled these 17 zombies of different shapes, and slowly walked into the cylindrical metal boiler built by the robots before, that is, the device like a steel-making furnace.

When the robot that guided those silver-level zombies into the metal boiler slowly exited the metal boiler and closed the door of the metal boiler.

Standing on the observation post, staring at Ge Pin and Gao Tian Hikaru in the central area of the medicine capital, their breathing stagnated.

The moment the metal boiler door closed, the Calamity Angel-class battleship, which had been suspended in the air, moved again.

At the bottom of the battleship, I don't know what device, shot straight out of the blue light.

And the target of this blue mang is precisely the center of the medicine capital city, the metal boiler that is a bit like a steel-making furnace.

"Roaring ——!"

When this blue light shot from the Calamity Angel-class battleship hit the metal boiler, the silver-class zombies who were brought to the metal boiler all roared.

At the same time, the metal boiler also began to shake violently, and it seemed that the silver-level zombies in the boiler were suffering unspeakable pain.

However, the boiler on the ground only shook for less than a minute before it gradually stopped, and the sound of non-stop roaring in the boiler had completely disappeared.

The entire metal boiler is surrounded by a rich blue glow.

And as time slowly passed, the blue color on the surface of the boiler began to slowly change, and a trace of scarlet quietly climbed onto the body of the metal boiler.

After about five minutes, the blue glow on the surface of the metal boiler had completely disappeared, replaced by a rich patch of scarlet that seemed to be irresolvable.

As this strand covered the surface of the metal boiler, the scarlet glow reached its peak.

A red glow shot out from the surface of the metal boiler and shot straight at the Calamity Angel-class battleship overhead.

When this red ray hit the Calamity Angel-class battleship suspended in the air, it seemed to be like a blood-like red ray, slowly seeping into the shell of the Calamity Angel-class battleship.

However, this continuous process was not long, and the red light emitted by the metal boiler only lasted for a few tens of seconds before dissipating into the air.

As the red glow dissipated, the robot, which had been on the ground, opened the door of the metal boiler again.

"Hiss——!"

Ge Pin and Hikaru Takada, who were holding ultra-high magnification military ranging telescopes, gasped after seeing the door of the metal boiler open.

At this moment, inside the metal boiler, the 17 silver-level zombies that originally walked into the boiler according to the guidance of the robot have completely disappeared.

Instead, there were several piles of ash on the ground inside the metal boiler.

"What the hell is this spaceship doing, they just 'burned' these 17 silver-level zombies?"

Hikaru Takada exclaimed again when he saw the scene in the telescope.

Although from his point of view, 17 silver-level zombies turned into ashes is a good thing worth celebrating.

But these 17 silver-class zombies were crawling on the bones of nearly 10,000 ordinary survivors, so he couldn't figure out what the spaceship in the sky wanted to do.

And Ge Pin, who was standing beside Gao Tianguang, was silent for a while after seeing the ashes in the metal boiler, and then slowly spoke:

"You said the red glow from the metal boiler that looked like a steelmaking furnace was charging the ship overhead?"

"Charging?" Takada Hikaru was also stunned when he heard Ge Pin's thoughts, but he immediately fell into deep thought.

The action of the Calamity Angel-class battleship and the metal boiler on the ground just now is indeed a bit like the action of energy interaction.

The Calamity Angel-class battleship shoots out a blue glow with no energy source, and after the energy conversion of the metal boiler, it turns into a red glow with energy, which is fed back to the Calamity Angel-class battleship.

And among them, the fuel is the 17 silver-level zombies that have turned into ashes.

"The spaceship suspended above the medicine capital, the dispatch of robots to find zombies, and the series of actions to transform human survivors into mutated zombies, are all just to replenish its own energy!"

After Ge Pin and Hikaru Takada came to this conclusion, both of them involuntarily took a few steps back.

For now, only this conclusion can explain the strange behavior of robots.

Since the Calamity Angel-class battleship in the sky above Yaodu does not have the ability to move on its own, it is necessary for robots to wrap zombies in Yaodu and transform them into mutated zombies.

And converting bronze-level zombies into silver-level zombies may be a further purification energy, after all, in terms of the energy in the body alone, bronze-level zombies and silver-level zombies are not on the same plane.

As for the final step, the Calamity Angel-class battleship shoots out a light with no energy source, and after the energy conversion and charging of the metal boiler, it becomes a usable energy source and sends it back to the Calamity Angel-class battleship.

"Could it be that the reason why mankind has encountered the end of the world is that this spaceship above the medicine capital needs to be recharged?"

Ge Bin and Hikaru Takada, almost at the same time, looked at the Calamity Angel-class battleship suspended in the sky above the medicine capital with complex eyes.

If things are as they think.

Then for a civilization with a Calamity Angel-class battleship, all living beings on the earth, for them, are just a one-time power bank.

All the creatures on the earth are the energy sources they can use at will in order for the spacecraft to take off again, and they don't care about the thoughts and lives of all the creatures on the earth.