With the undead knights sitting on the mechanical horses, the cowboys began to gallop toward the mountains as the cultivators saw them leave.

In the other direction, the four teenagers and their beasts were about to reach the outskirts of the city.

"We should go, or else those kids are going to fight alone with whatever is in that city," said Ethan.

"Yeah, we should move before one of them dies," Zack replied while laughing.

Like that, the three groups of cultivators began to move at a steady pace. The city was a few kilometers away, and the beasts moved much faster than the cultivators did, so they arrived much earlier.

In more or less half an hour, they were already very near to the city. So close that they could distinguish the figures that were surrounding it.

At first, they looked like humans walking aimlessly, but after closer inspection, they realized that they were wearing torn and blood-stained clothing. Tons of them were missing some limbs, and their eyes were deep black. There were even some with guts hanging out.

"Undead?" Owald asked." But they seem different compared with the knights."

"Not only that, but I feel a clear enmity with them. It seems like they are our target," said Ethan.

"It looks like they have already started the party," Zack said while laughing.

By the side of the city, they saw how the four invocations began to mow down the undead.

While a golden eagle and a black dragon flew through the air while spitting flames of their respective colors, a giant boar charged through the hordes of zombies that tried to attack it, and a long silver snake began to gobble up any enemy that crossed its path.

These actions made the zombie population drop rapidly.

Even if everything looked perfect at first, things began to become complicated in no time.

After a minute or two of battle, the snake stopped its movements. Its silver scales began to darken with the passing of every second, and its eyes became completely black.

The kid riding it realized that something wasn't right with his companion, and quickly drew a card from his deck.

"Healing card, dispel toxins, activate!" he shouted.

As if reacting to his words, the card began to burn as a dim light covered the snake's body.

The teenager sighed in relief, but when the light disappeared, the beast began to shake violently, causing him to fall off.

"Ouch! Silifid, what the hell are you doing? You made me fall from your back!" the kid began to shout to the snake.

The beast began to look at him for a few seconds before it began to open its mouth.

"What? What are you doing?" his summoner asked.

At that moment, terror appeared on the kid's face as he tried to get up from the ground and distance himself from the beast as soon as possible. With a swift movement, he drew a card from his deck. But before he could do anything with it, the snake swallowed him whole in one bite.

"Adrix! No!" shouted the other summoners from their mounts.

At the same time, the cultivators managed to get close enough to the battlefield to see how everything happened.

"Hey, you. We have problems. Big problems." said the leader of the summoners when the cultivators got close enough.

"You have lost the life of one of your friends. We saw it," replied Owald. "This is war. It happens sometimes."

"No, that's not the problem. That's the problem." He replied while pointing at the snake.

When the cultivators looked at the beast, they saw it writhing on the ground as if eating the kid was causing it great pain. Suddenly, the now darkened scales began to lose even more color, and the snake began to shed its skin.

In less than ten seconds, the process was complete, and what looked like a horn began to emerge on the creature's forehead. And then, the snake began to shed its skin again.

And again.

And again.

The process repeated itself a few times, each time changing a few characteristics of the snake, which ended up with a long horn on its forehead and a pair of wings on its body.

"The World-Eater Snake Silifid has the power to absorb any skill or property of the things that it eats. It has eaten Adrix and his deck, so it seems like now it's able to use its full power without any restrictions," the leader of the teenagers explained.

When the metamorphosis ended, the snake raised its head to the sky and released a cry, which was mimicked by all the undead that were surrounding it.