Gwen thought of an answer she could give to his question. 'Fera actually means beast...', she finally spoke. After a short break, she added : ’And Verto stands for...', but she couldn’t remember what that was. Bummer. ‘Verto is something like… turning? Or transfigurating’

Realizing that what she said wasn't so smart, Gwen decided to add something:'Fera Verto is a spell that Transfigures animals into water goblets. If done incorrectly or with a faulty wand the transformation will only be partially successful', there! And that's all I know.