Hardening Charm

Hardening Charm
Incantation	Duro (DYOO-roh)
Type	Charm Transfiguration
Hand movement
Light	None
Effect	Turned objects to stone

"The Hardening Charm will turn an object into solid stone. This can be surprisingly handy in a tight spot. Of course, most students only seem to use this spell to sabotage their fellow students' schoolbags or to turn a pumpkin pasty to stone just before someone bites into it. It is unwise to try this unworthy trick on any of your teachers."

— Miranda Goshawk, Book of Spells

The Hardening Charm (Duro) was a charm that turned an object to stone.

History

During the 1986–1987 school year, the Hardening Charm was taught to third-year students in Transfiguration class at Hogwarts School of Witchcraft and Wizardry. Jacob's sibling briefly used this spell on a Jumbo Dungbomb, as a part of Tulip Karasu's plan to prank on Merula Snyde, Barnaby Lee, and Ismelda Murk.

During the Battle of Hogwarts on 2 May 1998, Hermione Granger cast this spell at a tapestry, turning it into stone and wounding the two Death Eaters who were pursuing her, Harry Potter, and Ron Weasley.

Known practitioners

Minerva McGonagall

Hermione Granger

Jacob's sibling

Etymology

Duro is Latin for "I harden" or "I stiffen"; the same term is Spanish and Portuguese for "hard" or "rough"; it makes sense given J. K. Rowling's relation to the language.

Appearances

• Harry Potter and the Deathly Hallows (First appearance)
• Wonderbook: Book of Spells (First identified as Hardening Charm)
• Harry Potter: Hogwarts Mystery
• Harry Potter: Magic Awakened (Mentioned only)