It is said that once a person on the Yunxiao Continent swears an oath using their own blood and the "Ninty-Nine Thunder Tribulation," anyone who dares to break it will be struck down directly by the tribulation.
Many similar incidents have occurred across the Yunxiao Continent.
Therefore, no one dares to lightly swear an oath by the "Ninty-Nine Thunder Tribulation."
Chapter 351