|"Are you a wizard or not?"
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- Ron Weasley : "Hagrid did well, didn't he? How come all the spells bounced off him?"
- Hermione Granger: "It'll be his giant blood. It's very hard to Stun a giant, they're like trolls, really tough... but poor Professor McGonagall... four Stunners straight in the chest and she's not exactly young, is she?"
- — Discussion of Hagrid surviving multiple Stunning Spells[src]
The effects of spells could be resisted in certain circumstances. Wizards and witches may have had this trait naturally, as displayed by Harry Potter's and Bartemius Crouch Junior's resistance to the Imperius Curse. Magical creatures and beings such as giants and half-giants may also have had the natural ability to resist spells.
In magical creatures
Giants, dragons, Graphorns and trolls had considerable spell resistance, with hides that repelled all but the most concentrated and powerful spells, although they were still vulnerable to attacks on their eyes such as the Conjunctivitis Curse, possibly owing to the eyes being weak. It took almost half a dozen wizards to stun a dragon in preparation for the Triwizard Tournament. This attribute was also shared with half-giants, such as Rubeus Hagrid, who was able to resist repeated stunning in 1996.
The natural resistance to certain spells was among the information contained on Creatures in the Folio Bruti. This was measured by a series of bars, one each for each combative spell being assessed by the book. The further to the right the bar was, the weaker that creature's resistance to that spell.
Dragon hide seemed to retain much of its protective power after the creature's death, and so was often made into protective gloves that could protect the wearer from hazards such as burning. A dragon-skin coat could make the wearer resistant to most spells.
- "Look at that, you lot... Potter fought! He fought it, and he damn near beat it! We'll try that again, Potter, and the rest of you, pay attention — watch his eyes, that's where you see it — very good, Potter, very good indeed! They'll have trouble controlling you!"
- — Fourth year Harry resisting the Imperius Curse[src]
Young witches and wizards might often lose control of their magical skills when they were under emotional strain. This may have had a defensive use when in danger.
If somebody willingly gave their life for another person or people they would be protected. This was called sacrificial protection. This form of spell resistance only applied to spells from that individual.
Lily Potter willingly gave her life for her son Harry Potter, so when Voldemort sent a Killing Curse at the child it just rebounded and struck Voldemort, destroying his physical body and weakening him severely.
When Harry Potter gave his life during the Battle of Hogwarts, his friend Neville Longbottom should have died when Voldemort paralysed him and set him on fire, but Harry Potter's magical protection let him break free of the spell and kill one of Voldemort's Horcruxes, Nagini.
- Harry Potter and the Prisoner of Azkaban (video game) (Game Boy Advance version only)
- Harry Potter and the Goblet of Fire (First appearance)
- Harry Potter and the Order of the Phoenix
- Harry Potter and the Half-Blood Prince (Mentioned only)
- Harry Potter and the Deathly Hallows
- Pottermore (Mentioned only)
- Wizarding World (Mentioned only)
- Wonderbook: Book of Potions (Mentioned only)
Notes and references
- Harry Potter and the Goblet of Fire, Chapter 15 (Beauxbatons and Durmstrang)
- Harry Potter and the Goblet of Fire, Chapter 34 (Priori Incantatem)
- Harry Potter and the Goblet of Fire, Chapter 35 (Veritaserum)
- Harry Potter and the Order of the Phoenix, Chapter 31 (O.W.L.s)
- Harry Potter and the Goblet of Fire, Chapter 19 (The Hungarian Horntail)
- Fantastic Beasts and Where to Find Them
- Harry Potter and the Prisoner of Azkaban (video game) - Game Boy Advance version
- Harry Potter and the Goblet of Fire, Chapter 18 (The Weighing of the Wands)
- Harry Potter and the Chamber of Secrets (video game)
- Wonderbook: Book of Potions
- Harry Potter and the Order of the Phoenix, Chapter 24 (Occlumency)
- Harry Potter and the Half-Blood Prince, Chapter 6 (Draco's Detour)
- Harry Potter and the Deathly Hallows, Chapter 33 (The Prince's Tale)
- Harry Potter and the Deathly Hallows, Chapter 36 (The Flaw in the Plan)