C452 Background of the school of godly doctor

A dark blue skull was engraved on the Xuanyin and netherworld's mask. If one were to carefully look at this symbol, they would have a strange illusion that this dark blue skull was about to move.

This was also where the Xuanyin and netherworld was powerful.

Illusion Techniques!

His killing technique could only be described with a few words: drunken stupor