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"There! They'll repel water!"
Hermione Granger after casting the charm on Harry Potter's glasses during a thunderstorm[src]

The Impervius Charm[4] (Impervius)[4][1] was a charm that made an object repel water[1] and mist.[3] This could be used to allow someone better sight in bad weather conditions by preventing the rain from hitting their faces.[4]

This charm did not have any effect on solid objects, as seen when Hermione Granger attempted to defend herself and her comrades against the cascading and burning treasures in the Lestrange Vault.[5]


During the 1990–1991 school year at Hogwarts, Professor Flitwick taught seventh-year Charms students how to perform this spell.[6]

On 2 September 1997, this charm was recommended by Hermione Granger to Ron Weasley as a way of protecting Corban Yaxley's belongings from the rain in his Ministry office until it could be stopped.[7]

Known uses

Caster(s) Date Notes
Hermione Granger 6 November, 1993 Hermione used this spell to make Harry Potter's glasses repel water during a rainy Quidditch match.[1]
1 May, 1998 Hermione used this in an attempt to protect herself, Ron Weasley, Bogrod, and Griphook from the burning, multiplying treasure in the Lestrange Vault at Gringott's Bank during break-in.[5]
Gryffindor Quidditch team 1995-1996 school year The entire Gryffindor team used it on their faces to try to practise in a driving rain, but they still gave up after an hour.[4]

Know practitioners


The incantation is derived from the English word "impervious", which means "not allowing something to pass through" or "not penetrable".

Behind the scenes


Notes and references

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Harry Potter and the Prisoner of Azkaban, Chapter 9 (Grim Defeat)
  2. Scholastic Harry Potter Official Pronunciation Guide
  3. 3.0 3.1 Bloomsbury Glossary: I
  4. 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 Harry Potter and the Order of the Phoenix, Chapter 18 (Dumbledore's Army)
  5. 5.0 5.1 5.2 Harry Potter and the Deathly Hallows, Chapter 26 (Gringotts)
  6. 6.0 6.1 6.2 Harry Potter: Hogwarts Mystery, Year 7, Chapter 41 (That's Awkward) - Charms Lesson "Impervius"
  7. Harry Potter and the Deathly Hallows, Chapter 12 (Magic is Might)
Charms (class)
PS Wingardium Leviosa feather.gif
Charm-book writers and developers
Blagdon Blay · Daisy Pennifold · Delfina Crimp · Miranda Goshawk · Jarleth Hobart · Basil Horton · Helixa Hyslop · Syna Hyslop · Randolph Keitch · Levina Monkstanley · Orabella Nuttley · Mnemone Radford · Scarpin · Elliot Smethwyck · Felix Summerbee · Violeta Stitch
Professors Fortinbras · Filius Flitwick · Abraham Ronen · Unidentified male professor
Textbooks Achievements in Charming · Extreme Incantations · Quintessence: A Quest · The Standard Book of Spells
Charms studied at Hogwarts
Anti-Alohomora Charm · Ascendio · Banishing Charm (Depulso) · Blackboard Writing Spell · Blue sparks · Box Blasting Charm (Cistem Aperio) · Bubble-Head Charm · Cheering Charm · Cleaning Charm · Colour Change Charm (Colovaria) · Confundus Charm (Confundo) · Counter-charm for hiccoughs · Dancing Feet Spell (Tarantallegra) · Descendo · Disarming Charm (Expelliarmus) · Disillusionment Charm · Drought Charm · Entrancing Enchantments (Theoretically) · Eradication Spell (Deletrius) · Engorgement Charm (Engorgio) · Extinguishing Spell · Exploding Charm (Bombarda) · Fire-Making Spell (Incendio) · Freezing Charm (Immobulus) · Freezing Spell (Glacius) · Full Body-Bind Curse (Petrificus Totalus) · General Counter-Spell (Finite Incantatem) · Gouging Spell (Defodio) · Growth Charm · Ice Jinx · Impervius Charm (Impervius) · Knitting Charm · Knockback Jinx (Flipendo) · Leg-Locker Curse (Locomotor Mortis) · Levitation Charm (Wingardium Leviosa) · Locking Spell (Colloportus) · Locomotion Charm (Locomotor) · Lumos Solem Spell (Lumos Solem) · Mending Charm (Reparo) · Memory Charm (Obliviate) · Muffliato Charm (Muffliato) · Nonverbal spells · Pack Charm (Pack) · Red Sparks (Vermillious) · Reductor Curse (Reducto) · Scouring Charm (Scourgify) · Seize and pull charm (Carpe Retractum) · Severing Charm (Diffindo) · Shrinking Charm (Reducio) · Silencing Charm (Silencio) · Slowing Charm (Arresto Momentum) · Skurge Charm (Skurge) · Softening Charm (Spongify) · Spell for growing legs · Substantive Charm · Summoning Charm (Accio) · Tickling Charm (Rictusempra) · Unlocking Charm (Alohomora) · Vinegar to wine spell · Wand-Extinguishing Charm (Nox) · Wand-Lighting Charm (Lumos) · Lumos Maxima · Water-Making Spell (Aguamenti)