It had an important use?
Lu Xuan thought about it. If Shi Buyi was telling the truth, then there must've been something in the Immemorial Path that was very important to the bloodline of the sacred ones.
In that case, Liu Haotian wouldn't be the only person to benefit from this. Lu Xuan had the blood of the sacred ones, as well.
Lu Xuan's born Taoism aptitude had developed far more than Liu Haotian's. The only reason why nobody noticed it yet was that he knew of a secret art that could hide his force.
If this played an important role in the born Taoism aptitude, then it would've also been very useful for Lu Xuan.
Besides, Lu Xuan was very interested in what the sacred ancestor had left behind.
After all, the sacred ancestor was his ancestor, too!
Although his surname was not Liu, the blood in his bones still came from the sacred ancestor.