Hong Yu stared, dumbfounded, at a pitch-black corner of the Royal Treasure Vault.
The corner was tucked away between the shelves holding the *Celestial Soul Nine Refinements* and an array of other Secret Manuals. It was extremely dark; almost anyone would miss it unless they were specifically looking.
Hong Yu had only discovered this corner because the Profound Celestial Tower inside him had suddenly pulsed as he was leaving after obtaining the *Celestial Soul Nine Refinements* and passing by this very spot.
'There aren't many things that could make the Profound Celestial Tower react!'
Even an Advanced Primordial Weapon like the Godslaying Spear, with all of its Spirit Array Runes still under Seal and its power untapped, hadn't elicited any response from the Profound Celestial Tower.
But one thing was certain: anything that could pique the Profound Celestial Tower's interest was definitely no simple object.
"What is this?"
Hong Yu squatted down.
