Using the highly advanced art of spell creation, Voldemort was able to create four spells/magical items unique to him alone. These included being able to fly under his own power, creating the infamous drink of despair, the rudimentary body potion, and morsmordre.
If Lord Voldemort wasn't one of the most evil wizards the wizarding world has ever known, then he would surely be remembered as one of its most brilliant. Case in point: he achieved what was long thought to be a magical impossibility, and invented a spell that allows the user to fly.
Voldemort's signature spell was Avada Kedavra. Harry's was Expelliarmus. We know which we prefer.
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
Some would say there's no spell worse than Avada Kedavra, the Killing Curse that Voldemort used so indiscriminately. But it's definitely not the wizarding world's only Unforgivable Curse. And beyond those three, there are other types of magic that arguably do more harm than anything else.
To create a Horcrux is to commit a horrific sin in the wizarding world. A Dark wizard of yesteryear called Herpo the Foul was known as the first to dabble with Horcruxes and would be one of the rare ones to do so. For this magic involves carrying out a terrible atrocity, which then begins to tear apart your soul.
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.
Voldemort's greatest fear is death and as a result a boggart takes the form of his own corpse. It is unsurprising that this is Voldemort's biggest fear. After all, he did split his soul up encasing it in various horcruxes just so to keep himself from dying.
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.
7 Draco Malfoy: The Protean Charm.
I've always suspected Molly's lethal spell was a particularly well-placed and powerful stunner that stops Bellatrix's heart, which is consistent with the description of her death: Molly's curse soared beneath Bellatrix's outstretched arm and hit her squarely in the chest, directly over her heart.
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.
Alohomora, which is a spell that unlocks objects (and it's also Hermine Granger's signature spell).
Avada Kedavra meaning
Rowling claims she created this spell out of a popular “Abra-Kadabra” saying in Aramaic which means “Let the thing be destroyed”.
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.
Lord Voldemort was also able to practice powerful wandless magic. From what we were able to glean about wandless magic from those that practiced it in Harry Potter, it's particularly volatile, and can only be used effectively by powerful and disciplined wizards and witches.
Hermione's bluebell flames
Hermione first uses it against Snape when she and Ron think he is cursing Harry's broom in his first Quidditch match. Her bright blue flames set Snape's robes alight, before Hermione scoops them up and puts them into a jar.
Avada Kedavra
Topping the list for the most powerful spells in the Harry Potter universe is no other than Avada Kedavra, Voldemort's favorite to instill his will and fear onto others. The spell itself is a play on Abra Kadabra and is easy to cast by just about anyone in the Wizarding World.
We see that: [Hermione] raised her wand, pointed it at Harry and whispered, 'Levicorpus. ' Where "nvbl" means "non-verbal." Harry proceeds to try out the spell on Ron nonverbally, and it works just fine.
Albus Dumbledore
It is not certain what the specific fear is as he is not fearing the death of his sister as she is already deceased and it is suggested that Dumbledore fears that it was him who directly killed his sister in the conflict or that he fears the loss of control that lead to his sister's sudden death.
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.
Bellatrix had a fear of rejection as well where Voldemort was concerned, wanting nothing more than to please him but was always frightened that she would lose his favor.
What Is Dumbledore signature spell? There were two; Apparation and Invisibility. Dumbledore must have used these particular skills thousands of time in his lifetime for any number of purposes. His vast gathering of knowledge probably came as a result of his skill in appearing and disappearing at will and unseen.
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.
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.