|"Are you a wizard or not?"
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- "Harry had already attempted a few of the Prince's self-invented spells. There had been a hex that caused toenails to grow alarmingly fast"
- —Description of this hex[src]
This hex was invented by Severus Snape and recorded in his copy of Advanced Potion-Making during his school years at Hogwarts School of Witchcraft and Wizardry. Therefore, it had not been approved by the British Ministry of Magic.
Behind the scenes
- It is unknown when Severus Snape invented this and many of his other spells as according to Sirius Black "he knew more curses when he arrived at school than half the kids in seventh year."