Indeed, it was Fluid Alchemy without a doubt.
All the theories and spiritual circuits used, even the interference of properties and the skills of spiritual refinement, were fundamentally derived from Fluid Alchemy, supplemented by the further extensions of Modern Alchemy.
Professor Ye certainly knew this.
After all, Ji Jue had submitted everything he knew, but she only briefly flipped through the basic theories and applications, completely disregarding the rest, simply confirming there were no hidden dangers before tossing it back to Ji Jue and not bothering any further.
Just like that, with a touch of understanding and only a taste of it... she casually left Ji Jue miles behind!
While Ji Jue was still immersed in the basic content of Fluid Alchemy, Professor Ye had already started "Reverse Divine Skill"!
Since the essence of Fluid Alchemy was to enhance the inherent nature of the materials and thus drive the advancement of the form and carrier, then, why not use it in reverse?