Lu Yan had mastered seven of the Body Refining Martial Arts to the level of Unity of Man and Martial Arts. He was itching to complete the last two.
After persisting for two days, Lu Yan finally surrendered and negotiated with Guan Shan. He gently coerced and persistently nagged Guan Shan until he got the last Immortal Bone from his hand.
Guan Shan was left with only a single Immortal Horn.
Guan Shan clearly expressed that he could not give the Immortal Horn to Lu Yan as it was one of the few mementos left behind by Chu Chenzhou that he kept as a memory.
After obtaining the Immortal Bone, Lu Yan did not immediately consume it.
He was afraid of wasting it.
He started to contemplate the speed Martial Arts.
A month later, Lu Yan had managed to practice three speed Martial Arts to the novice level.
Only then did Lu Yan regulate the Dao Book, swallowing that piece of Immortal Bone to enhance his Body Refining Martial Arts.