Found it...
Xu Yuan lowered his eyes to examine the Willow Ghost Blade in his hands, the corners of his lips unconsciously curving into a smile.
That strange, familiar feeling did not come from within him but through the Willow Ghost Blade he held as a medium.
It seemed that twenty thousand years ago, Tian Ye used some kind of ritual binding secret technique to forcefully bind herself to the ghost blade.
Nevertheless, no matter what, Xu Yuan was now certain that Tian Ye, with whom he had been entangled in the Illusionary Realm for over a decade, was indeed still alive.
It was just unknown how that enchantress had managed to live from twenty thousand years ago until now.
Luo Xiran had transformed herself into an essence spirit oddity and entered hibernation to preserve her spirit.
Old Man Luo had researched the transformation of otherworldly ghosts, cultivating his disciples specially to seize their bodies for eternal life.