What if

the chaotic fluid is useless for those below the true immortal realm, but it is very useful for those at the true immortal realm.

if a true immortal wants to make a breakthrough, he must transform himself from the inside out. Every transformation is a leap in power, but it's too difficult to transform. Sometimes, he has to rely on external objects.

the chaotic fluid is a treasure that can help a true immortal transform. It has the same function as immortal medicine. Many immortal medicines can also help a true immortal transform and help a true immortal find the opportunity to transform.

Explained heaven flowing sand.

Lu Ming's eyes lit up. A treasure that could help a true immortal break through was definitely precious. In a sense, it was not inferior to an immortal weapon.

"Is it useful for immortal kings?"

Lu Ming asked curiously.