Tianhou Ling

He is the founding ancestor of the Daluo Sword Sect and has reached the late stage of Jing Nie.

[Spoiler] His true identity is the clone of the fourth-step cultivator of the Ni Chen Realm, the Old Man of Extinction, who was ordered to monitor Tian Yunzi in the Cave Realm. [/Spoiler]

(Source: Baidu Baike, translated)