Paradise Constellation Array
Leaving aside the little "sneak peek" that Aser accidentally took of Eris, the next amazing thing that Aster witnessed, was the resonance between those two's yin and the formation that was about to be finished.
Just like any man, regardless of having a yang type constitution, can cultivate is yang as a subdivision of the energy path, apart from their respective attribute, women can do the same with yin.
In fact, the stronger they get, the stronger their yin gets as well, and so the moment Mylene retrieved her aura, the yin cores started releasing yin energy which gathered around those two.
It was quite an awe-inspiring portrait, two beauties surrounded by those dark blue sparks, it made them look like fairies, which made sense, considering with their original cultivation they would have been taken as goddesses by the natives of a Mortal plane.