Upon hearing the noise, we ran back to the first cave. Unsurprisingly, that was the final call of the mother beast, a call of suffering. On the platform, it raised its head and howled at the sky. After a few seconds, the mother beast's head dropped down. It was dead. I could see a pearl rolling out of the mother beast's mouth.

We ran toward the mother beast. The young beast did not step forward. Rather, it stood still and bid its mother a final farewell with its eyes. I picked up the pearl from the ground. The pearl was spotlessly white, and apart from the machine liquid around it, it didn't appear to be anything special.

"This might be the crystalized energy of the mechanical beast," I analyzed.

At that thought, I handed the pearl to the young beast. However, it completely ignored me, so I placed the pearl into my backpack instead, deciding...