In the game, Fanged Beasts could do anything, soaring through the skies and burrowing underground. They could even chase down Elder Dragons single-handedly and beat them senseless without taking so much as a scratch.
But in Xie Wen's inherited memories, even the most seasoned hunters made thorough preparations before every hunt. As for novice hunters, their very first lesson was how to conceal themselves properly so they wouldn't accidentally disturb a monster they couldn't handle while exploring.
Although the Monster Hunter world had no such thing as Conqueror's Haki, its hunters could still use the various techniques they had mastered to suppress, mask, and scramble their own presence.
Xie Wen had used these concealment techniques as the foundation for developing his very own "Observation Haki Killer."
In addition, the Hunting Art: Beast Soul, which Xie Wen had previously considered useless, had provided some unexpected help in developing his Observation Haki Killer.
Unlike the Beast Soul in his inherited memories and the game, which strengthened its user, Xie Wen had no so-called "beast soul" here in the One Piece world. Even if he used the skill, he ended up possessing a whole lot of nothing.
Of course, Xie Wen wasn't entirely willing to accept having such a useful skill but being unable to use it, so he had tried capturing and creating beast souls himself. Although his inherited memories contained no complete method for creating beast souls, the hunters who had learned Beast Soul had picked up at least a little knowledge on the subject.
Unfortunately, perhaps because the two worlds operated under different rules, or perhaps because the method Xie Wen knew lacked some crucial steps, he had successfully made a vessel for a beast soul, but it couldn't hold a "beast soul" at all.
Xie Wen had originally thought