Boom!
A violent current of air blasted upward from underground. With the rock walls on both sides of the valley narrowing together, the updraft surging from below accelerated as it rose.
A drone tried to cross the updraft, but even after entering the clouds more than a hundred meters aboveground, it still could not find an opening.
The updraft blasting from underground toward the sky seemed to reach straight to the heavens. In the end, the drone was blown away by the raging winds and crashed into the rock wall.
The image being received on the screen on the ground consequently vanished.
The drone pilot shook his head at Luo Yan and the others. "No. We've already risen to an altitude of two hundred meters, but we still couldn't find an entry point."
"Besides, the valley walls are estimated to be over a thousand meters high. Crossing this updraft from the air is practically impossible."
Luo Yan folded his arms. "Can the mechas get through?"
An engineer held a tablet computer. After running some calculations, he shook his head.
"Although the mechas are heavy, the updraft is moving too fast. Even your Yao Yuan would have trouble passing through with its Anti-gravity Field after entering the current."
"The other mechas are even less capable."
Bai? exhaled. "In that case, only 'sacrifice' remains."
She glanced at the Fire Rats. The creatures had already awakened and were squeaking loudly.
Unfortunately, Old Vine had bound their bodies as tightly as zongzi. They could not break free at all.
At that moment.
Before them lay the sacrificial site depicted in the rock paintings.
On the flat ground, before the cliff ahead, stood clusters of stone spikes over ten meters tall.
These stone spikes, large and small, were covered in grooves. The grooves converged on