Starting from Shrouding the Heavens: Segment 774

Before the Demon Venerable fell, he drew countless Immortal Dao Thunders down upon this island. It was not for fun, but to use the power of the Immortal Dao Thunder to completely obliterate the Weird Being he had killed during his Tribulation Transcendence.

Just like on the Dam Boundary, where an unparalleled powerhouse had fished up countless Thunder Pools and gathered the Power of Heavenly Tribulation from the All Worlds to suppress the Weird.

The Demon Venerable had likewise borrowed the power of the Immortal Dao Thunder to suppress and obliterate the Weird Being he had killed.

The reason Tuoba Yu'er had appeared on Demon Island was related to her cultivation.

Back then, after coming from the Lower Realm to the Upper Realm through the route provided by the Jietian Sect, Tuoba Yu'er had not yet broken through to the Venerable Level.

After arriving in the Upper Realm, she remained in the Jietian Sect to cultivate. It was only recently that her cultivation formally broke through to the Venerable Realm.

After breaking through to the Venerable Realm, the Jietian Sect had originally arranged for her to complete Nirvana by drawing the Dao into her body within the sect.

However, Tuoba Yu'er followed the orthodox Immortal Ancient Method Cultivation System. Simply drawing the relatively complete Heaven and Earth Laws of the Upper Realm into her body for Nirvana could not forge a pure Immortal Ancient Method foundation for her.

Therefore, Tuoba Yu'er left the Jietian Sect to search for an Immortal Land left behind from the Immortal Ancient Period.

Originally, she had intended to borrow the Five Elements Immortal Mountain within Immortality Mountain to undergo Nirvana.

After all, the Five Elements Immortal Mountain in the hands of the Ageless Heavenly Venerate was an Origin Immortal Mountain that possessed Immortal Dao Origin