"Hey, you are good with illusion arts, right?" Lucas asked.
Pearl nodded, and then cast an illusion that could give her wings; feathered wings, to be precise. And as Lucas saw it, he was amused, stupefied if it could be considered as one, as he didn't know how detailed Pearl's imagination was.
And as Lucas tried to assess it, he was more impressed that she was able to make it more believable. Despite it only being an illusion, Pearl's ability to make it real was also good. It wasn't just because it could passively make it real, but illusion and mutation using illusion arts were different despite their similar descriptions.
Mutation needed compatibility, even if it was just created from illusion, but, in Pearl's case, it was as if she could create any extension to her body, and she just needed her imagination.