The Undying Fruit is an extremely rare World Treasure that grows on the Undying Fruit Tree. This tree can only sprout from the ashes left behind after a Phoenix undergoes nirvana in the region of Extreme Cold. The tree produces only two fruits at a time. The Undying Fruit can enhance a person's overall talents, special physique, and bloodline. It can heal any type of old injury and even repair shattered dantian.
A person can undergo nine nirvanas in total after swallowing the Undying Fruit. This allows them to be reborn and evolve in every aspect a total of nine times. Each nirvana enables a person to break through a minor stage in their cultivation, regardless of their current realm. However, during this process, the individual must endure the excruciating pain of being burned alive nine times.