Not only were there memories of the demon dimension, there were also memories of the time when Nailisi was imprisoned in the Goddess' temple. Amongst the demons that had been imprisoned, Nailisi was the weakest.
Every supreme demon and devil could have killed her easily without much effort.
These supreme demons and devils were carefully gathered by the humans and they had all formed a deep impression in Nailisi. After she survived the ordeal, all the supreme demons and devils became her source of food. That was the feeling of devouring fear. Nailisi would never forget how she trembled as she chewed on the bones of those corpses. The remnants of power in those corpses were so overwhelming that her mental strength almost collapsed.