Amid a low rumble, the entire underground stone hall began to tremble violently.
The spirit crystals on all four sides bloomed with dazzling light in unison, and the Array Disk at the center suddenly spun faster.
Array seals surfaced, veins interwove, and as if they had come alive, they crazily swallowed and spat out the power of the earth veins and the Spiritual Qi.
Even the whole of Tianshu Peak gave off a muffled echo at that moment.
Feng Jianxing's eyelid twitched sharply.
In just an instant, he clearly sensed that the underground stone hall, which had originally been relatively independent, had, under Xu Qingfeng's activation, completely linked together with the Yun Ge Sect's Mountain-Protecting Array.
And beyond the Mountain-Protecting Array, deep within the earth veins, there were clearly several obscure yet astonishing auras also echoing in response.
Clearly, this Array Hub beneath Tianshu Peak was not an isolated existence at all.
"What a Tianshu Peak!"
Feng Jianxing's heart went cold. His gaze quickly swept across the stone hall, and his expression involuntarily grew several degrees more solemn.
The three men in gray robes, green robes, and black clothes each occupied one side, the auras around them connected to the formation's momentum.
Together with Xu Qingfeng holding the center, although only four Tribulation Crossing stage cultivators were present at this moment, the pressure formed by borrowing the power of this underground Array Hub and the Mountain-Protecting Array far surpassed that of several ordinary Tribulation Crossing stage cultivators joining forces.
Not to mention, those powerful auras echoing over from outside the array were clearly no kind souls either.
As the thought flashed through his mind, a few degrees of true chill appeared in Feng Jianxing's eyes for the first time.
"Fellow Daoist Su, be careful!"
With a warning from his mouth,