The tiny crystal contained a cultivation system completely different from the Quintessential Essence system.
For example, demons mainly focused on their bodies, their demonic powers being secondary. Human Godfiends' bodies were secondary, while Quintessential Essence was their primary focus. However, the legacy obtained by Meng Chuan was purely for body cultivation.
This system was split into several levels. Foundation Establishment, Diamond, Divine Power, Undying, Blood Droplet, Sage Becoming, and Mythical.
The Foundation Establishment realm required a first-stage Essence Soul for successful cultivation. The Diamond realm required a second-level Essence Soul, and so on. The Mythical realm's threshold was a seventh-stage Essence Soul.