"Buzz!" With a hum, a drone accelerated to full speed, rose straight into the air, and flew toward the ceiling of the space.
Boom! Before the drone had risen very high, it turned directly into a ball of fire.
"What the..." Miller was speechless. He had seen it clearly: against the dim blue glow, the drone had flown into midair as if it had struck something, instantly turning into a fireball.
"Damn it! There may be an invisible Barrier in the air!" Zhou Ziyun immediately tried to sense it, but his Power of Heaven and Earth detected nothing. Unable to make a firm judgment, he could only speculate that there was an invisible Barrier.
Miller, however, did not use his Mental Power to probe the invisible Barrier in the air. He had always remained cautious in unfamiliar environments. If his Mental Power came under attack, it would be no minor matter.
So, without understanding the situation—and in such a dangerous place—he naturally would not carelessly use his Mental Power.
He gestured again and said, "Use another drone. This time, be careful. Don't fly too high."
"Yes!" An Ability User under his command immediately answered, took another drone from his backpack, checked it over, and began launching it.
This time, being more cautious, they did not send it soaring upward as before. Instead, it rose slowly. At less than ten meters high, it began flying toward the pyramid-shaped structure.
When it reached the structure, the drone encountered a transparent Barrier. Blocked by it, it could not proceed any farther.
"Captain, there's a Barrier over there. We've hit it and can't move forward." He handed the portable display to Miller as he spoke.
"Circle around the perimeter and see what's behind the building," Miller said after looking at the display.
The operator