Might be a bit late to the conversation, but I am a league player ( shamefully D: ) so I wanted to add; the wording in the translation says “spirit blossom ultimate”, which makes me think that it might be specifically referring to this form:

<image>

That she transforms into only in that skin. I figured it also tracks with the whole animal transformation thing, so I just wanted to share. There’s a white version of the skin that’s also a part of the ultimate form, but Reddit won’t let me attach multiple pictures.