‘It converts the target object into a smooth slide’, the girl answered, making a short break after having said that. ‘Glisseo is a charm that makes rough or rigid surfaces to become temporarily smooth and slippery’, Gwen said, hoping that this sounded better than her first remark.

‘I think Hermione Granger used it to turn a staircase into a slide during the Battle of Hogwarts so that she, Harry Potter and Ron Weasley could avoid attacking Death Eaters.’ There…and that’s all I know.