"Strongest True Immortals!"
Through Jin Haoran's description and the memory of Immortal Sui Mu, he understood the concept of the "Strongest True Immortal."
This, essentially, was the pinnacle a True Immortal could attain.
Any tier above Supreme True Immortals belonged to the rarified realm of those with exceptional talents and the Heavenly Immortal Immortal Masters.
Heavenly Immortal Immortal Masters, far beyond what Cave Heavens could harness in battle power, were termed Supreme True Immortals.