Turns stairs into slides
- "He was on the sixth stair when there was a loud, wailing, klaxon-like sound and the steps melted together to make a long, smooth stone slide like a helter-skelter."
During the Battle of Hogwarts on 2 May, 1998 Hermione Granger cast this spell the stairs on which she, Harry Potter, and Ron Weasley were standing flattened into a chute down which they slid very fast down the staircase in an effort to escape the Death Eaters pursuing them.
- Godric Gryffindor
- Helga Hufflepuff
- Hermione Granger
- Rowena Ravenclaw
- Salazar Slytherin
- Harry Potter and the Order of the Phoenix (First appearance)
- Harry Potter and the Deathly Hallows (First identified as Glisseo)