Things You Didn't Know About Wizarding Curses And Potions

Hermione demonstrated the use of a powerful curse that no one seems to know of. After all, not even Albus Dumbledore managed to reverse the effects of the jinx placed on the list of names for Dumbledore's Army. 

This curse made boils form on Marietta Edgecombe's face to read the word "SNEAK," and Dolores Umbridge failed to remove them despite repeated attempts. As it is, the boils eventually went away but Marietta's scars never did, and she continued to have the word faintly visible on her face since Hermione never gave the counter-curse.

Antonin Dolohov certainly made full use of his ability to create spells, as the dark wizard used his powers for nefarious reasons. During the fight in the Department of Mysteries in Harry Potter and the Order of the Phoenix, Dolohov hits Hermione with a spell that knocks her out instantly, and it's feared that she's passed on. Although she recovers, it takes weeks to do so, and Madam Pomfrey has no idea what the cure for her internal injuries is.

In reality, nobody could have known the cure since no one knows what curse Dolohov used. He created this spell for his own use and made it so he uttered it non-verbally, meaning Dolohov was the only person in the world capable of pulling off this deadly spell.

Ginny Weasley sure can be mean-spirited but is never called out for her attacks on others. She makes light of using the Bat-bogey curse on Zacharias Smith, yet the hex is so intense that it can even have fatal consequences. The curse causes bats to sprout out of the victims' noses that then proceed to viciously hurt them.

The reason why it can be fatal is the fact that the person hit by the hex can't breathe, as a particularly strong variant of the Bat-bogey curse can result in constant bats manifesting, leading to the person choking to their demise.

The reason why Voldemort had no empathy even as a child was due to the fact that he was conceived when his father was under the influence of a love potion. The truth is that a person isn't truly in love when they consume the potion, as it's more along the lines of unhealthy obsession.

The side effect to this is that a child born out of such a union will have a lack of understanding of love, which is why Voldemort never feels it. However, it doesn't mean the child has no chance of experiencing love, as they can very well perceive it if they are raised in a loving environment.

According to JK Rowling:

[The love potion] was a symbolic way of showing that [Voldemort] came from a loveless union – but of course, everything would have changed if Merope had survived and raised him herself and loved him.

What just about nobody realizes about the Polyjuice potion is that its ingredients perfectly create a blend that turns a person into the identity of another. Without even one of these elements, the potion will not work, and it's understandable why when one analyzes the meaning behind the ingredients. 

Lacewing flies allude to the binding of identities; leeches evoke sucking out the essence of a person; horn of a Bicorn refers to duality; knotgrass means to be tied to another; fluxweed is the changing of the body; Boomslang skin alludes to shedding the body and revealing another.

It's generally a talking point as to why Remus Lupin didn't just make his own Wolfsbane potion and had to rely on Snape for it. The reason is that the Wolfsbane potion is extremely expensive to brew, so much so that only a few can afford it. Hogwarts was able to have a full supply of the potion due to the funding it receives but the Wolfsbane potion is near-impossible to brew on an independent basis unless a person is particularly well off.

Its ingredients are made up of rare elements that can't be acquired unless the creator requests them from varying sources. The Wolfsbane potion is also a new invention that means it isn't well documented and only experienced Potioneers can emulate it. Remus was a poor Potioneer in general and his state of poverty meant he didn't have the funds to get the ingredients for the Wolfsbane potion.