Most of these weird creatures of various types they met from then on were Mortal Grade, much like one would mostly meet Mortal Grade Demonic Beasts on the outside.
They also served as excellent starting off point for Hong Yue to once again get used to her sword cutting live flesh, as there was no remorse that followed with creatures that explicitly only sought to kill anything that entered their view.
Wu Long also warned her, that any cultivator they met in this Secret Realm was not someone who 'just came in to cultivate here'.
Secret Realms like this one specifically were famous for being brutal struggles for life, an arena for the survival of the fittest.
Many Sects or specific Masters sent their Disciples in these for the explicit purpose of having them go through a meat grinder and emerge covered in blood of enemies, treating it as a rite of passage or a test.
