Black qi was coming from egg.
The egg was quite big itself and the black patterns were kinda similar to the qi wings that Xia Feng had seen when he first checked his bloodline.
It was quite easy to guess that the egg holds angel within it.
However, considering the qi, Xia Feng knew that this is 'fallen' angel, and he kinda couldn't understand why.
Why he, the erossu angel, was getting such spirit creation.
"It's normal for me to have lady as spirit creation."
He is erossu after all. Ladies are patiently waiting on his journey and even dual cultivating once with those ladies can be considered greatest lucky chance! Of course for ladies only.
So as erossu, Xia Feng was fine with spirit creation being lady. But how could it have black qi when he has never ever touched the black one? His mind tried to comprehend this while more and more cracks appeared on the egg itself.
Quickly enough, the small hand sent away part of the shell!
Xanae is mature lady whose body got turned into qi by the egg! She is way older than Xia Feng! As to how she is here and why her body turned into qi within an egg and appeared in erossu' dantian, one shall find in further, further chapters by the end of the lesser realm arc! She is no longer a living being, but the creation for real with a flexible body!
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Spoiler at the end of author's note to avoid misunderstandings.
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She had never died, but her body got turned into qi because of 'Samsara Egg' technique that Xia Feng has yet to gain control over. The samsara egg turns people on the brink of the death into 'spirit creations' thus saving them/turning into spirit creation. He did it unconsciously, so spirit creation's memories are kinda shattered. But she knows who she is, her years, some techniques etc.