- "Any student found in posession [sic] of a spell-check charmed quill will be punished severely"
- —Educational Decree Number One[src]
A Spell-Checking Quill is a type of quill that is used to correct an individual's mispelling.
Behind the scenes
- It is possible that when the charm wears off it results in worse spelling than before, as Ron's homework was left with terrible misspellings: "belligerent" starting with "bum" and "augury" with "org", as well as "Dementors" as "Dugbogs", and his own name became "Roonil Wazlib".
- Ironically, the misspelled name "Roonil Wazlib" partially saved Harry Potter from being condemned for using the cheating notes textbook when Harry used Ron's textbook to pass the inspection, as when Severus Snape checked Harry's books, the name in the book has changed enough for Harry to claim it was his nickname.