Malfoy spots Harry and casts a Cruciatus curse; Harry, defending himself, using the Half-Blood Prince's Sectumsempra spell without knowing its effects. To his horror, it gashes Draco's face and chest, spilling his blood everywhere.
Sectumsempra is a very dark curse that causes a cut (Latin "sectum" = "cut") which will not heal ever (Latin "semper" = "always").
Sectumsempra Explained
He invented the curse for the use of retaliation against his bullies at school (one of whom was Harry's father, James).
Harry didn't disarm Draco in Half Blood Prince. That happened in Deathly Hallows. Harry disarmed Malfoy in the Malfoy Manor when he wrested away three wands from Draco. Yes, wresting away is still defeating the wizard.
Harry Potter World on Twitter: "6 May 1997: Harry used Sectumsempra on Draco Malfoy.
Malfoy spots Harry and casts a Cruciatus curse; Harry, defending himself, using the Half-Blood Prince's Sectumsempra spell without knowing its effects. To his horror, it gashes Draco's face and chest, spilling his blood everywhere. Moaning Myrtle flies off, screaming.
Sectumsempra | Harry Potter and the Half-Blood Prince - YouTube.
7 Draco Malfoy: The Protean Charm.
Cruciatus Curse ('Crucio')
Repeated use of the Cruciatus Curse is torture and Bellatrix Lestrange subjected the Longbottoms to such extremes of pain that it sent them insane.
Voldemort's signature spell was Avada Kedavra. Harry's was Expelliarmus.
There is likely a good reason that the Sectumsempra is not an unforgivable curse. It's mostly because Sectumsempra is Snape's personal curse that he created. It is not a widely known or used spell, and it is one that he kept secret — which means it can't be added to the list since no one really knows about it.
Those learning Legilimency began with a spell and an incantation – Legilimens. Snape demonstrated this to Harry during their first Occlumency lesson, in a bid to teach him the skills needed to shut his mind to Voldemort's Legilimency attacks.
Blood spurts from Draco's face and chest, and Myrtle beings screaming. Snape bursts into the room and heals Draco's wounds almost immediately. Snape hurries Draco to the hospital wing, commanding Harry to wait behind.
Harry makes use of two of the Unforgivable Curses in the books. Dueling with Bellatrix Lestrange, he attempts the Cruciatus curse, with limited results; Bellatrix says that he has to really hate someone to make the Unforgivable Curses work properly, righteous indignation isn't enough.
Snape save Draco by using Vulnera Sanentur spell. 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 intentions of using it against his enemies and it soon became one of his specialties."
Voldemort killed Snape in Harry Potter And The Deathly Hallows Part 2 using his Horcrux snake Nagini instead of his favorite Unforgivable Curse, Avada Kedavra.
Riddikulus
Riddikulus is the spell that's used when facing a Boggart, and it's used to turn the Boggart into something that the caster finds funny. While this is definitely a useful and necessary spell in this one situation, it's a rather weird idea.
The three Unforgivable Curses in Harry Potter are Crucio, Imperio, and Avada Kedavra, and all three are available to Hogwarts Legacy players. Crucio subjects the victim to extreme torture, while Imperio puts them under the control of the spellcaster.
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.
Ginny and the Bat Bogey Hex
As the youngest Weasley, we're sure Ginny observed more than her fair share of unpleasant spells over the years but it was the Bat Bogey Hex she was famous for – and with good reason.
In this game, it becomes clear that Draco Malfoy's Boggart is Lord Voldemort. Draco's fear of Voldemort likely comes from different reasons than others have. Most fear Voldemort taking over the world. Draco fears Voldemort intimidating and manipulating the Malfoy family.
Actor Tom Felton had his naturally brown hair dyed on a weekly basis to maintain Draco's white-silver locks while shooting. Only in one film, out of the whole series, did he opt for wearing a wig.
It's unknown quite how they managed this, although we do know that certain spells do levitate things, such as the Levitation Charm, or Snape's self-penned spell, Levicorpus.
It was Snape who taught Harry his signature spell: Expelliarmus.
Voldemort killed Snape in Harry Potter And The Deathly Hallows Part 2 using his Horcrux snake Nagini instead of his favorite Unforgivable Curse, Avada Kedavra.