Su Fan's expectations had been correct. At that moment, the winds and clouds suddenly changed across heaven and earth.
The sky, which still retained traces of smoke and bloodshed, suddenly split open like a gigantic pitch-black gash.
The enormous opening resembled a wound where heaven and earth had been torn apart by brute force. Twisted spatial turbulence flowed along its edges, while wisps of Spatial Fragments drifted within, radiating a heart-palpitating aura of annihilation.
Terrifying pressure poured down from the rift like a tsunami, carrying the unique savagery and brutality of the Upper Realm and instantly enveloping the entire Cliff Mountain Fortress.
This vast and terrifying pressure far surpassed that of any ninth-order demon beast before it. Merely allowing its aura to leak out left the Human Race cultivators below stiff from head to toe, their bones creaking as though they were being crushed beneath billions of kilograms of boulders.
Even the circulation of their Spiritual power became incredibly sluggish, as if their meridians had been filled with lead and mercury.
Many cultivators with lower cultivation levels even had their legs buckle under the pressure, dropping directly to their knees. Blood spilled from their mouths and noses, their eyes vacant, and they lacked even the strength to struggle.
"Not good... the Upper Realm Great Demon Clones are about to descend..."
Above the fortress, a Human Race Integration Stage powerhouse had a face as pale as paper. Even his voice trembled uncontrollably, while the Spiritual power around him fluctuated in utter disorder.
The Human Race cultivators in the Ganlun Realm war zone were all too familiar with such scenes.
Whenever the Demon Race fell into a life-or-death crisis, they would open an ancient altar and offer a vast quantity of demon souls as sacrifices to summon Upper Realm Great Demon Clones