Because the man in black had previously been mysteriously stripped of a portion of his chakra, after using his detached arm to stab Yuzhen in the abdomen, he immediately pulled the arm back before Yuzhen could react further.
In the blink of an eye, the man in black and his severed arm completed a remarkably smooth "reattachment."
Yuzhen instinctively looked up and, sure enough, saw an extremely obvious centipede-shaped old scar at the man's shoulder... No wonder his attack had been ineffective. The enemy's arm had originally been a "connection port" for Earth Grudge Fear.
At most, his attack had severed some of Earth Grudge Fear's tendrils.
In short, Earth Grudge Fear was a secret technique that transformed its user into a "tentacle monster," generating countless slender, hair-like tendrils inside the body and greatly increasing the user's attack power, vitality, and resistance to blows.
Most importantly, this secret technique allowed its user to take the hearts of other ninja and, based on them, directly acquire the ability to perform nature transformations in different chakra attributes.
It could be said that a user of Earth Grudge Fear could become a ninja proficient in the nature transformations of all five chakra attributes without relying on his own talent or training, simply through the selfless "contributions" of others... In a sense, this was somewhat similar to Yuzhen's "learning path."
Regardless, Yuzhen had encountered a ninja whose strength far surpassed his own.
"You know about Earth Grudge Fear... It seems your origins really are extraordinary." The man in black did not miss Yuzhen's mutter.
The secret technique Earth Grudge Fear was extremely obscure. Anyone who could identify its origins at a glance could be counted on one hand.
This secret technique could not even be said to be passed down within a ninja clan.