Venerable White and Venerable Spirit Butterfly obtained a lot of inspirations from this small 'self-recovery' technique that Immortal Cheng Lin had left behind in the ancient ruins.
At first glance, it seemed just a small technique to grow back severed limbs. But the truth was that Immortal Cheng Lin's way to immortality was concealed within. The way to immortality that could allow the user to give birth to itself.
Actually, Venerable White and Venerable Spirit Butterfly had finished studying this small 'self-recovery' technique quite a few days ago. Now, they had to think of a method to extrapolate Cheng Lin's way to immortality from the technique and use it as a reference to create their own way to immortality. However, it wasn't something simple; it required a lot of time.
The reason they had stayed in the ancient ruins for so long was to give the other fellow daoists the time to grasp this magical technique as well.