At Ling Fei's words, even Nangong Wentian, his companion, felt a chill run down his spine and his heart tremble.
Those words concealed a smoldering flame of rage and murderous intent. With Ling Fei's standing as a Formation Array Master, it was hard to imagine what he might do.
"I'll go get the others." Nangong Wentian could barely contain his excitement. He hurriedly spoke, then left in a flash.
Not long afterward, under cover of night, seven figures slipped out of the Yellow Fortress and headed toward the High-Level Heavenly Vault.
The fortresses' defensive arrays needed to have their energy replenished from time to time. They didn't need to supply it themselves; each fortress was self-sufficient. But while the energy was being replenished, the arrays' defensive capabilities were greatly reduced—and that was when the two sides had their chance.
The same had happened at the captured Universe Fortress. Its defensive array needed replenishing far sooner than expected, catching them off guard. That was how Gu Hanyu and his people had managed to break through.
When a defensive array was intact, breaking through it was extremely difficult.
Even if they managed it, they would expend a great deal of time and energy. Not even the Quasi-Immortal Emperors of the High-Level Heavenly Vault would have enough strength left to attack a fortress after breaking its array.
So neither the High-Level Heavenly Vault nor the Imperial Alliance would consider breaking through an intact defensive array.
Both sides waited for an opportunity, waiting for the defensive arrays to replenish their energy before launching an attack.
That was why both sides sent people to keep watch on the enemy fortresses. At the first sign of trouble, they would immediately alert everyone.
After leaving the Yellow Fortress, Ling Fei, Nangong Wentian, and the others ran into