The Little Cold Deer Illusions were indeed formidable, even deceiving her Biological Recognition Spell. If not for the fact that Mu Ying's Magic Mark had to land on a physical body, she wouldn't have noticed at all.
But once she realized that all the protected Little Cold Deers were fake, the bunch of illusions seemed very false to her.
Mu Ying observed for several days in a row but still could not find where the real Little Cold Deer were.
However, she did get a clear understanding of the Cold Deers' daily activities.
The level 11 Cold Deer leader and three level 10 Cold Deers would usually stay near the camp in Luoxia Mountain.
Those three level 10 Cold Deers always guarded around the Little Cold Deer Illusions, and even if they sometimes left for a while, only one would leave at a time.
Seeing the degree of their meticulous protection, no one could guess that they were guarding a virtual illusion.