Boom boom boom!
A succession of explosions rang out like thunder, deafening the ears.
With every explosion, the entire Feathered Saint City shook violently.
Fang Yuan stood amid the ruins, sensing the tremors running through Feathered Saint City, his figure hidden within the billowing dust.
"Enslaving a Gu Immortal really is a thousand times harder than enslaving beast herds!" Fang Yuan carefully felt the pressure on his soul.
Enslaving other living beings placed a burden upon the Gu Master's own soul.
Back in Northern Plains, during the Imperial Court Struggle, Fang Yuan had commanded countless ferocious beasts, but he had not enslaved all of them directly. He had indirectly controlled the entire beast horde army by enslaving Beast Kings, Thousand Beast Kings, Hundred Beast Kings, and the like.
Man is the Spirit of All Things. Wild beasts possessed little intelligence, so Fang Yuan could enslave many of them.
But now, when Fang Yuan enslaved Zhou Zhong, it was entirely different.
Zhou Zhong possessed deep intelligence and spirituality. Although enslaving him had not failed, it had placed an extremely severe burden upon Fang Yuan's soul.
After all, Zhou Zhong was a Gu Immortal!
A rank six Slave Immortal Gu could only enslave rank six Gu Immortals.
"This is also because Zhou Zhong is a feathered folk rather than a pure human. His spirituality is still a shade inferior. If I had enslaved a pure-blooded Human Gu Immortal, I might already have failed."
"Though I once cultivated soul path and had some Soul Foundation, that was merely the limit of a mortal. To a Gu Immortal, it is exceedingly shallow. After enslaving Zhou Zhong this time, my soul has completely lost its liveliness. I was once like a young man who could stride like flying, but now I have become an old