The Hylean Flow is the flow of information that runs between cosmi on a Quantum level. It is thought to only run in one direction, and some believe that the direction is from more perfect to less. Jules Verne Durand mentions that, in his experience, the societies of Urnud and Tro did in fact seem less perfect than that of Earth (where he was from), and that the societies of Fthos and Arbre each, in turn, seemed more perfect yet.

Manipulating the Hylean Flow is possible, as demonstrated by fraa Jad, but takes decades (though more likely centuries) for one person to develop that praxis.

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