|"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 (he had tried this on Crabbe in the corridor, with very entertaining results)..."
- — 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.
Notes and references
- Harry Potter and the Half-Blood Prince, Chapter 12 (Silver and Opals)
- Pottermore - All about... Severus Snape
- Harry Potter and the Half-Blood Prince, Chapter 28 (Flight of the Prince)
- Harry Potter and the Goblet of Fire, Chapter 27 (Padfoot Returns)
- Harry Potter and the Half-Blood Prince, Chapter 19 (Elf Tails)