In the end, his mind twisted, and he started sneaking into frontier cities, using ordinary citizens or other cultivators for his experiments.
He boldly named this method of extending flesh and Divine Soul as the "Longevity Technique."
However, as expected... he got caught.
Yes, caught by Liu Jian.
When caught in the act, someone like Xuan Xiaozi would certainly try to eradicate all traces, as he was a renowned figure, an elder of Xuanyin Sect, following the previous Sect Leader for many years, and naturally possessing ample Magic Treasures and techniques.
At that time, though Purple Cloud Palace and Xuanyin Sect were at odds, they hadn't completely torn their relationship apart like now. The two battled near the Western frontier, and the outcome was self-evident.
