When Aiven used the ritual [Eye of All-Seeing] held by Milan to search the world for the fourth and fifth volumes of "Flesh Sacrifice," there was no feedback from them.
It turned out that the fourth volume was indeed sealed in the [Clock Tower] and had already been retrieved, but the fifth volume had not been sealed. Instead, it had fundamentally transformed into a powerful Ocean Treasure!
The essence of an [Ocean Treasure] is a type of treasure that naturally forms when certain unique items are influenced by the mysterious factors of this world under special nurturing conditions.
The reasons for their formation are bizarre, and their shapes are diverse. It can be said that anything in the real world has the potential to transform into an Ocean Treasure with unique functions.
Moreover, before the beginning of the Age of Navigation, such treasures already existed in great numbers.
