When Aerith just decided to trust Desire on this one, she immediately started to talk about the Monster's Way.
Since she was the one who told her daughter about the Monster's Way, it was only natural for her to know about it.
Anyway, what Aerith tackled first was the origin of the Monster's Way. Of course, since it is the Monster's Way, it is literally about the monster's way.
It is about how the monster could rank up and get stronger even though they have been limited by their natural advantages.
She also said that the Monster's Way was created by the past monsters who were so strong they can destroy the world and go to another one.
Those monsters created the Monster's Way for the other monsters who couldn't get strong due to being limited.
She also compared the Monster's Way to the system that the humans have.
However, they weren't really different as the monsters have the system, too.