The Xuanyin Source Water was the coldest and most Yin water in the world.
Though it was attracted by Ling Han, or rather attracted by the Thousand Transformations Tortoise of the Indestructible Heaven's Scroll, and entered into his body, it was not the slightest bit docile. Wherever it passed, it would completely freeze that part of Ling Han's body.
Thankfully, Ling Han's body still contained the presence of the Nine Heavens Flame, which could resist the Xuanyin Source Water, and safeguard Ling Han's life force. Otherwise, even if the Xuanyin Source Water had no intention to kill him, it would still destroy every single bit of his life force in this process, and Ling Han would really die for nothing.