The four-winged "Dark Spirit Demon Bat" beat its wings, sending blade-like wind edges flying forward one after another.
These wind edges not only severed the ice spikes filling the sky, but also continued onward with undiminished force, slashing toward Li Yan's body.
As Li Yan retreated at high speed, he deployed increasingly dense ice spikes across the air, blocking and attacking at the same time.
The two rapidly retreated and pursued each other through the passageway, leaving behind a world of ice crystals wherever they went.
The severed ice spikes continuously plunged into the ground, and "thud thud thud..." rang out without end along the way.
No one knew what material these passageways had been forged from.
Though the two Golden Core Realm experts unleashed their spells, apart from pits of varying sizes gouged into the ground by ice spikes of different lengths,
the tunnel walls merely gave off metallic "clang clang clang..." sounds. After swaying wave after wave, they showed no other abnormalities.
Those two-winged "Dark Spirit Demon Bats" did not dare approach at all. They could only trail from afar, waiting for an opportunity to strike.
They all knew that unleashing powerful spells across the sky like this consumed spiritual power at a terrifying rate. Even Golden Core Realm cultivators could not keep it up for long.
Sure enough, after the two had fought through passageway after passageway for roughly the time it took to drink a cup of tea, cold sweat was already streaming down the human cultivator's forehead, and his face had turned pale.
The four-winged "Dark Spirit Demon Bat" opposite him looked far better than Li Yan, and it naturally noticed that something was wrong with Li Yan.
"This man's spell attacks cannot be underestimated. Just what cultivation technique does he practice? His spiritual power