This scene left Di Tianqing and the others dumbfounded.
The walls had already risen several dozen meters. There was no way to climb over them in a short time.
The rearguard troops, fighting as they retreated, had already slammed into the monsters and begun a desperate battle.
Only upon truly clashing with these monsters did they realize how troublesome they were. They were clearly Level Four or Five monsters, yet their strength in battle reached Level Six, with some even possessing Level Seven power.
Ordinary soldiers could barely break the defenses of a monster with Level Seven strength!
But Luo Fengshan had indeed prepared a backup plan.
The moment he saw the Controller lowering the walls, he had considered that the Controller might also raise them.
So Luo Fengshan had made arrangements in advance.
At that moment, dozens of mech vehicles carrying ultra-high-power Phase-Change Energy Blocks charged back from the retreating formation toward the rearguard.
They had come to support the rearguard troops who were covering the retreat.
A commander named Sun Wen was the deputy commander in one of those vehicles.
Watching the wall slowly rise in the distance, he roared at the driver:
"Quick, quick, quick! Accelerate!!"
For every extra second it rose, they had one second less for the rescue. Who knew how many more soldiers behind the wall would die.
The vehicle tore through the landscape, and whenever it encountered even a small slope, it seemed ready to leap into the air.
When they finally neared the wall, Sun Wen could wait no longer. He took out a Phase-Change Energy Block radiating a powerful gray glow, jumped from the vehicle, and charged at the wall.
Phase-Change Energy Blocks were made by extracting energy from Phase-Change Energy Cores and reinjecting it into energy blocks. A high-powered one