Many things had both advantages and disadvantages. Even their drawbacks could prove advantageous under the right circumstances.
For example, one effect of the Crystalline Tyrant's influence was the partial restoration of Supernatural Perception.
That was no good thing. In essence, it was the same kind of distortion as the one happening to himself right now.
But during this process of corruption, his senses could become a little sharper.
Of course, merely sharpening them a little was nowhere near enough to see through Lord Rom's concealment technique.
That was where his years of academic study came in.
Back on Leaf Island, he had already tried to deduce the principles behind that kind of top-tier concealment technique while talking with Lady Nepheli.
He had even compared his conclusions against the case of "Crow Feather."
The conclusion he had reached was that the core principle involved concealing oneself within a specific person's perception.
The process was so extreme that it was extraordinarily difficult to detect, while the host's observations of the outside world were also restricted.
So even if the technique's creator was the one using it, Fu Qian had never underestimated how difficult it would be to discover.
But not underestimating the difficulty didn't mean giving up. It meant thinking from the very beginning about how to uncover it.
And he had indeed made a little progress—there had to be a host.
The reason this concealment technique was so effective was that it was like adding an extra layer of encryption.
The host used their own existence to help conceal the parasite's, but that also made the host an indispensable part of the process.
In the present case, he had analyzed long ago that the seamless connection of Etched Wisdom was probably the result of a mutual bond.
Both the Inverted Lake