It is the key to open the Prime Ominous Grave. It can be found in the Necropolis, but very few people through the history were able to do it.

Current Era

In the Current Era, Li Qiye came to the Necropolis to find the Key in order to enter the Prime Ominous Grave and search for the disappeared Lost Island. He looked for the Key in different locations, and eventually obtained it from the Ancestral Flow's Master.[1]


Despite being called the key, it is actually looks like the ancient piece of paper with mysterious runes.[2]


It can open the Prime Ominous Grave.


  • 38 Appearance(s) of Prime Ominous Key
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