Heavenly Kui Flower, among the many Heavenly Materials and Earthly Treasures depicted in the First Level's murals, is arguably the most useful, yet also said to be utterly useless.
To advance from the King Martial Realm to the Emperor Martial Realm, the biggest challenge for Martial Artists, aside from their Cultivation, is to survive the Emperor Tribulation.
Unlike the King Tribulation, the Emperor Tribulation is much more terrifying and comes in various forms.
Many Martial Artists with exceptional talents have soared through the King Martial Realm, but when they attract the Emperor Tribulation while advancing to the Emperor Martial Realm, they fall because they cannot withstand it. If they manage to survive, their Cultivation greatly regresses and their Martial Arts Heart is damaged.
This shows the terror of the Emperor Tribulation.
