Lu Ren still had nearly four billion immortal stones on him. Taking out one billion directly did not pain him in the slightest.
All one billion immortal stones burned away, turning into a torrent that was almost instantly absorbed by the Ghost Fox Demon Spirit.
The Ghost Fox Demon Spirit completely solidified, resembling a terrifying immortal beast as it lunged at Lei Zhen and the other two.
Seeing this, Lu Ren was deeply shocked. He had not expected the Ghost Fox Demon Spirit to be powered by immortal stones as well.
Roar!
Demonic energy surged skyward from the Ghost Fox Demon Spirit. The nine tails blazing with ghostfire behind it shot forth, madly bombarding Lei Zhen and the other two.
Lei Zhen swung the longsword in his hand, doing his utmost to resist, but every collision left him in unbearable discomfort.
Lei Yunsheng and Lei Qingwu, meanwhile, could not hold out at all. They were blasted back again and again, vomiting blood wildly.
"Senior Brother Lei Zhen, Lu Ren has burned one billion immortal stones. I'm afraid that can keep this immortal beast going for a long time. If we keep fighting, it will only be disadvantageous to us!"
Lei Qingwu's expression was grim.
Though Lei Zhen appeared to be holding back the Ghost Fox Demon Spirit, its nine tails could still launch attacks, frenziedly assaulting Lei Qingwu and Lei Yuansheng.
The three men and one beast clashed madly, causing the entire inner space of the Nine Thunder Seal Array to shake violently.
"That immortal beast is far too terrifying!"
"This is what a magical artifact can do. A powerful magical artifact can reverse the tide of battle in an instant!"
Shock filled many faces.
"Let's retreat first!"
Lei Zhen sensed that if they continued resisting, he might be able