In Harry Potter and the Deathly Hallows: Part 2, Gregory Goyle uses Fiendfyre and dies instead of Crabbe.
Yes, Voldemort was able to use and control Fiendfyre, as demonstrated in the Battle of Hogwarts in the seventh book of the Harry Potter series, "Harry Potter and the Deathly Hallows".
Dumbledore didn't use the Fiendfyre to destroy the horcrocx because they were infused with dark magic. His other option was simply smashing it with a sword (Gryffindor's sword). Which good guy would prefer to choose performing dark magic when the alternative is available in his own study? 2.
From the harry potter wikia: Fiendfyre is a type of fire made from Dark Magic. The spell originated from Dumbledore, who is admittedly a powerful wizard, he is not a Dark Magic user.
However, while Goyle is quickly subdued, Crabbe starts using the killing curse Avada Kedavra, showing his complete lack of compunction and humanity by this time. In the end, Crabbe is consumed by his own malice, being devoured by the Fiendfyre he has summoned.
In order to conjure the avada kedavra curse, you have to want to kill your victim. We all know that Voldemort could easily kill a child without an ounce of remorse... but not Snape. Snape didn't want to kill Dumbledore, and this was why the spell was blue instead of the usual green.
Firestorm. Firestorm was a spell that created a large ring of fire around the caster's wand. This spell is one of the last and most powerful spells that Albus Dumbledore cast using the elder wand before his death.
There are 2 reasons why: First, a use of one of the unforgivable curses will grant you a one way ticket to Azkaban, even if you use it to a beast. Second reason is, Harry doesn't know how to use it. You need to mean the want of killing, that's how you cast avada kedavra.
1 Avada Kedavra Is Just Ridiculous
Only love itself, the strongest magic of all, can block the Killing Curse. Lord Voldemort cast this spell constantly in his lifetime, and it's the spell that killed Harry's parents in particular.
It was the simplest of all escapes. He could have just pointed his wand in dumbledore's mouth and uttered the spell. There was no point trying to fill the cup with the spell then having dumbledore drink it.
It is an immensely powerful fire that cannot be extinguished by normal or enchanted water. It is also difficult for the caster to control, flowing from their wand in a continuous stream of flame.
Dumbledore and Grindelwald took a blood oath to not fight each other.
Rictusempra, the Perpetual Tickling charm, which apparently can be stopped by the Finite Incantatem charm, was used by Harry against Malfoy in the Duelling Club. The intent was, of course, to tickle Malfoy to the point that he would be unable to jinx Harry in return.
Learning. Mastering Avada Kedavra is a very hard job. The killing curse is one of the hardest of all spells to learn and can only be perfected by very powerful witches and wizards. There is no particular way to say the curse, although you must cast it in a particular way.
But the spell is in the script, and here's what it's called: Protego Diabolica. The Harry Potter wiki describes this spell as an “incantation to a protective spell, a modified version of the Shield Charm.
Quirrell didn't use the Killing Curse on Harry, because Voldemort said “use the boy” to get the Sorcerer's stone from the Mirror of Erised. If Quirrell had killed Harry right away, he would have lost the chance to get the stone.
The darkest of the Dark Arts, Harry Potter unforgivable curses are the Cruciatus Curse, the Imperius Curse, and the Killing Curse. Although the curses are highly illegal, Harry using Unforgivable Curses happened, but he uses them once he was thrust into the Second Wizarding War.
Harry Used The Imperius Curse Multiple Times During The Gringotts Heist. Harry does use Unforgivable Curses in the last movie, despite Harry Potter using Unforgivable Curses seeming unlikely because of his hero status. Death Eaters had a history of using Imperio to make innocent victims do their bidding.
Alohomora, which is a spell that unlocks objects (and it's also Hermine Granger's signature spell).
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
Expelliarmus: Harry Potter's Signature Spell | Wizarding World.
Sectumsempra is a curse invented by Professor Severus Snape, during his childhood, when he was known as "The Half-Blood Prince". He created it with the intention of using it against his enemies, and it soon became one of his specialties.
Because he didn't believe disarming him would be enough. After Dumbledore was dead, Voldemort would have been told everything. Including the fact that Draco disarmed Dumbledore. But all he cared about was who KILLED Dumbledore.
Severus Snape is one of the most divisive characters in the entire "Harry Potter" series. He was a double agent, so many character details were kept a secret. His mother was a witch and his father was a Muggle, leading to the moniker "The Half-Blood Prince."