Many little demons poured in through the crater, which was quite surprising. But when they reached the bottom of the volcano, Arthur saw that the first little demons to arrive were not going all the way down. Instead, they started tapping the inner wall of the volcano near the bottom with their claws. They seemed to be looking for something.

Suddenly, one of them screamed and began to dig frantically where it had been tapping. Other little demons rushed to help!

Arthur didn't understand what they were doing at first, but then he realized they were digging into weak points in the volcano's inner wall. These demons had an instinct to dig out these caves, a trait passed down through generations.

Arthur followed a group of little demons into one of the caves they had dug. There were many such caves all around the inner wall of the volcano. Every time one was dug out, a group of little demons would rush in.

Arthur understood that these caves were a way for the demons to escape when the volcano erupted. After each eruption, the magma sealed these caves, but the demons would dig them out again.

As thousands of little demons entered the caves, a loud explosion came from above, and hot magma poured in, sealing the entrance once more. Fortunately, no demons were hurt by the magma. When the magma stopped flowing in, the little demons ahead continued moving forward, and Arthur had to follow.

Arthur was surprised by how long the cave was. It felt like they had been walking for a very long time. He also realized that the cave was sloping downward, deeper into the ground.

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Arthur felt anxious. He didn't know where the little demons were leading him, but he had a feeling it was somewhere important.

After a while, the little demons ahead made a strange cheering sound. The ones behind became agitated and pushed Arthur to move faster.

Arthur had adapted to the darkness in the cave, so when he saw dim red light ahead, it seemed very bright. The light was accompanied by heat.

Finally, they reached the exit, a massive cave. Arthur's small figure looked tiny compared to the entrance. But he didn't have time to marvel at the sight because of what he saw below.

It was a huge underground space, a dark and eerie world. The ground was blackened soil, the trees twisted and black, and a river of lava flowed slowly. Numerous lava waterfalls fell from the cave walls, creating blue smoke and sparks, making the air hot and filled with ash.

Mountains filled the landscape, all in shades of black and red, creating a bleak and fiery world. The air was dirty, and hot blasts of air blew through, carrying the ash from the ground.

Arthur could only see a small part of this underground world, but he knew it stretched far beyond his view. It seemed like an underworld beneath the seabed, between the crust and the mantle, with a rocky dome for a sky and a hot core creating this fiery environment.

As Arthur contemplated what awaited him in this hellish place, he felt a strange mix of sorrow and excitement. The heat in the air stirred something within him, urging him to explore this world. It was a strange contradiction.

The little demons that had come after Arthur were already climbing down the cave walls excitedly. Arthur stood for a moment, sighing, before following them down.

The demons with wings had flown out, and the thousands of little demons from the hatching area flowed out of the small cave exits like ants. Arthur realized that they weren't the first demons to enter this world, and they certainly wouldn't be the last. How many demons lived here? How many adults?

As Arthur climbed down, he had no idea that he was only entering the uppermost layer of the vast abyss of the demon world, a place filled with endless mysteries and dangers.