In Deathly Hallows, Hermione faced a real test of her physical and psychological stamina. After being on the run from a bunch of Snatchers, the gang were taken to Malfoy Manor, where Bellatrix proceeded to torture Hermione using the Cruciatus Curse.
In the second part of the film adaptation of Deathly Hallows, this duel has some noticeable differences: In the film, Bellatrix casts a blue spell at Ginny Weasley instead of a Killing Curse, who deflects it using a Shield Charm. In the book she just avoids it.
This curse (incantation unknown) was used by the Death Eater Antonin Dolohov during the Battle of the Department of Mysteries in 1996. The curse was cast using "a sudden slashing movement with the wand," causing a streak of purple flame to strike the target.
How Did Molly Weasley KILL Bellatrix? What Spell? - Harry Potter Theory
Does Harry ever use Crucio?
Harry Failed With His First Two Crucio Attempts
While multiple figures tried to hit Harry with the Unforgivable Curse throughout the series, Voldemort hit him with the spell in the Little Hangleton graveyard during Harry Potter and the Goblet of Fire.
By contrast, he's never used Avada Kedavra, far less in a combat situation. His other uses of Unforgivable Curses have had mixed results: although he used the Imperius curse successfully while breaking into Gringotts, his initial attempts to use the Cruciatus curse on Bellatrix and Snape were unsuccessful.
Hermione Granger has sustained several injuries following her torture at the Malfoy Manor by Bellatrix Lestrange and presumably during the Battle of Hogwarts. Every scar fades in time, except the 'mudblood' carved on her arm by Bellatrix.
Yep, that happened: Bellatrix and Voldemort had sex sometime around Order of the Phoenix or Half-Blood Prince, and their wild night in bed led to a child named Delphi Diggory/Riddle/Lestrange. According to Delphi herself, she was born sometime before the Battle of Hogwarts.
In 1998, Fred participated in the Battle of Hogwarts, defending the castle's passageways with his twin. While fighting alongside his brother, Percy, he was killed in an explosion possibly caused by Death Eater Augustus Rookwood.
Love potions were banned at Hogwarts School of Witchcraft and Wizardry but this has not stopped students from making them, or from trying to win hearts by their use. Even Molly Weasley admitted to having brewed a love potion when she was a girl at Hogwarts.
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.
The Disarming Charm became Harry Potter's signature spell, and it notably caused the death of Lord Voldemort during the Battle of Hogwarts by rebounding his Killing Curse because the Elder Wand recognised Harry as its master through the spell connection, and thus strengthened the Disarming Charm to the point that ...
When Voldemort "killed" Harry in the Forbidden Forest, she asked him whether Draco was still alive, as she knew that the only way she and Lucius could search for Draco inside Hogwarts would be as part of Voldemort's victorious army.
Another established rule that Fantastic Beasts 3 retcons is that the killing curse is supposed to be unblockable by any typical protective spell. At the end of Fantastic Beasts 3 though, Grindelwald attempts to use Avada Kedavra on Credence, but Albus and Aberforth Dumbledore successfully block it using golden magic.