Ah, and then it goes from High to Earth to eventually Heaven you mean? That makes sense, I must have missed any explanation of that.
Not directly related, but in the vincinity, it would be nice if you could add a check when buying essence so that you either get a warning when trying to buy essence for something that's already maxed or completely remove maxed essences from the pool so you don't waste stones needlessly on that.
Anyway, keep it up, looking forward to what's next :)