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The first chapter to the [Book of Chaos] is focused on transformation.
Since the [Book of Chaos] don't follow any of the three known paths, it means that in order to cultivate this, Raven have to experience a metamorphosis. This change will get transform him from inside out, the book gave details to the cultivation path he's going to take and so far, he had seen two stage written in the first chapter: Metamorphosis and Gathering.
'Metamorphosis Stages' is pretty straightforward. It transforms the individual's body to become a proper vessel for Chaos Energy in the future. It has a total of nine stages, which means that he has to go under nine transformations as well. What makes this harder is that the resources he needed to cultivate is going to be a pain in rear to find. Reaching the peak of this stage would be roughly equivalent to reaching the Knight Stage in the Energy Path.