Supposedly Nero was turned into a bird for using forbidden magic 500 years ago. But in the present she was able to turn human again. Why was Nero able to return to her human form?
I think it is related to magic stones, after using forbidden magic, again and again, she turned into the bird and also the magic stones were lost. elves collected all the magic stones which help in turning back the wizard king into his real form and also the Nero. but I have a question of why she didn't speak to anyone earlier in any chapter. she only spoke once to finral.