The Ancestral Grandmaster was intent on finding the person cultivating the Heart Scripture of Myriad Poisons in Xianming City.
He felt that the people from the Celestial Sect in Xianming City, due to their low cultivation, were unable to assist him.
So, he left Xianming City and returned to the Celestial Sect.
This time returning to the Celestial Sect, he intended to borrow two people from the Master of the Celestial Gate.
One was a Daoist adept at Concealing Breath and Sensing Skills, with the Daoist name "Gu Yue".
The other was a cultivator skilled in array formation named "Luo Qigong".
Daoist Gu Yue was to assist him in tracing the whereabouts of the person cultivating the Heart Scripture of Myriad Poisons in Xianming City.
The Ancestral Grandmaster had been cultivating martial and magical arts of slaughter for tens of thousands of years.
He had hardly ever practiced concealment and sensing skills.
Thus, he knew himself well enough to understand.
