É importante notar que os feitiços mágicos podem variar em força, dependendo da habilidade e poder dos usuários.
“Avada Kedavra’s a curse that needs a powerful bit of magic be-
hind it — you could all get your wands out now and point them at
me and say the words, and I doubt I’d get so much as a nosebleed.
But that doesn’t matter. I’m not here to teach you how to do it.”
Fake Moody explica que as maldições exigem forte intenção e poder mágico por trás delas para funcionar de maneira eficaz.
how Parvati Patil had produced such a good Reductor Curse that she had
reduced the table carrying all the Sneakoscopes to dust.
Aqui vemos Parvati executando uma Maldição Redutora que conseguiu destruir uma mesa inteira. Harry, por outro lado, teve problemas para fazer um buraco na terra com uma maldição redutora no labirinto. cálice de Fogo.
Ainda mais cedo, vemos Lupin ensinando a Harry o charme do Patrono.
“With an incantation, which will work only if you are concen-
trating, with all your might, on a single, very happy memory.”
said Harry, quickly forcing his thoughts back
to that first broom ride. “Expecto patrono — no, patronum —
sorry — expecto patronum, expecto patronum —”
Something whooshed suddenly out of the end of his wand; it
looked like a wisp of silvery gas.
“Did you see that?” said Harry excitedly.
Aqui aprendemos que a força da memória feliz é o que aumenta o poder de um feitiço do Patrono. Vemos que, enquanto uma memória semi-feliz cria patronos enevoados de baixa potência, com uma memória muito feliz, o feitiço funciona com força total e cria um Patrono corporal.
Hatred rose in Harry such as he had never known before. He flung
himself out from behind the fountain and bellowed “Crucio!” Bellatrix
screamed. The spell had knocked her off her feet, but she did not
writhe and shriek with pain as Neville had.
“Never used an Unforgivable Curse before, have you, boy?” she yelled.
She had abandoned her baby voice now. “You need to mean them, Potter!
You need to really want to cause pain — to enjoy it — righteous anger
won’t hurt me for long — I’ll show you how it is done, shall I? I’ll
give you a lesson —”
Bellatrix explains that you have to MEAN it for the curse to work
effectively. Hermione and Ron’s confused queries about Travers and
Bogrod, who were both now standing there looking blank. “I don’t think
I did it strongly enough, I don’t know. . . .” And another memory
darted through his mind, of the real Bel- latrix Lestrange shrieking
at him when he had first tried to use an Unforgivable Curse: “You
need to mean them, Potter!”
Então agora para voltar a Snape, ele é um mago extremamente talentoso, um dos mais poderosos de toda a série por trás de Voldemort e Dumbledore. Ele tem a habilidade e o poder de amplificar uma maldição básica para adicionar força extra por trás dela. Como vemos apenas um ano depois, três feitiços desarmadores de Harry, Ron e Hermione têm a mesma força por trás deles que Snape.
“Expelliarmus!” he yelled — except that his wasn’t the only voice
that shouted. There was a blast that made the door rattle on its
hinges; Snape was lifted off his feet and slammed into the wall,
Finalmente, Snape usa intencionalmente muito poder em seu feitiço Expelliarmus, então necessário para embaraçar Lockhart.