This was because...
Lin Ye had already set up a strong-smelling plant spice item here.
Although its original effect could not be used under the influence of the secret dungeon, the special smell it emitted affected the canine's nose.
It was the same for the other items. The abilities given to them by the system had all lost their effectiveness, but their existing characteristics would remain.
For example, a cocktail that was originally used to recover health had become an ordinary drink that could only be used to get drunk.
...
"What do you mean?"
"Ko do valon (this enemy is very cunning and has set up strange things here. Our Hellhounds can't locate him unless he appears on his own initiative)."
"Naga Yala (I feel like he's trying to lure us out of the city so that he can attack us one by one. Look at the bodies on the ground. They were obviously attacked by the same thing and died at the same time.)"