Because that was truly a transformation in a real sense.
What Feng Yin did not know further was, once an ordinary nine-tailed celestial fox possessed its sixth tail, it could transform into a human form and start practicing in that form.
But under Feng Yin's continuous nurturing, Feng Ying's foundation, especially his spiritual roots, continuously refined, step by step, its foundation has reached a level that all demons would be in awe.
The innate demon essence had not yet grown before being gradually purified by Feng Yin.
Just like higher-grade demons finding it harder to reproduce, Feng Ying's transformation was equally difficult.
At this moment, she had grown her seventh tail, her battle power was comparable to the high-grade Greater Demons of the same race, but her appearance did not change much, she still maintained the slightly larger than palm-sized appearance that Feng Yin liked the most.
