Xiao Yun shifted his gaze away from Zhao Wuji's portrait and looked toward the sky above Windfire City. There was a vortex-like spatial passage there. It was precisely because of this spatial passage that those terrifying bolts of lightning could not invade the city, ensuring the safety of its residents.
Outside, however, countless bolts of lightning raged, as though the world had ended.
"Senior, that is the spatial passage leading to the Two Realms Battlefield. Although it shields us from the invasion of those terrifying lightning bolts, enemies from the Primordial World may invade through the spatial passage at any time."
Liu Feifei walked over and continued, "However, small spatial passages like this cannot accommodate experts above the Heavenly Emperor realm. At most, a few Great Emperors can come through. Moreover, their power is suppressed after entering, so Windfire City's combat strength is sufficient to resist them."
Xiao Yun's expression stirred slightly. "So the spatial passages above large cities and super cities are larger, allowing Heavenly Emperor and Heavenly Venerable realm experts to invade?"
"Correct!" Liu Feifei nodded. "The larger the city, the greater the area that needs protection, so the spatial passage above it is larger as well. However, even the spatial passages of super cities can only accommodate quasi-Heavenly Venerable experts. After coming to the Heavenly Realm, their strength is suppressed, and they are simply no match for peak Heavenly Emperors."
"After all, this is our home ground. Their combat strength was already inferior to ours at the same realm, and now their power is suppressed as well, so it is not much of a problem."
"However..." Liu Feifei's expression suddenly turned grave as she continued, "There are exceptions. For example, geniuses from the Primordial World, especially those possessing powerful magical treasures, are still extremely terrifying even after