(Seras POV)
The day after my birthday, I was finally given my own room in Malfoy Manor. No more Draco every waking moment of the day. My little brother was given a new room as well, and the old nursery was turned into a playroom that Draco had claimed simply through the sheer number of toys he had in there. Our new rooms each had a large bed enchanted to make sure we didn't roll out of it in our sleep. I believe that Draco can still find a way to hurt himself if he tries, but I see no point in complaining. We were given large toy chests with a charm that expanded the space inside. When I learn how to create artifacts, making a heightened version of this is a necessity. There are so many benefits to personal "inventory space." I could transport a lab anywhere I go and always have the perfect tool for any situation. This doesn't even touch on combat implications. Imagine fighting someone who can have a grenade, gun, or wand appear in their hand at any given time through smaller, more specialized spaces. A ring with enough space to hold a wand is more powerful than any concealed carry law and could help avoid many dangerous situations. Having a backup wand in case the first one is taken away would make an incredible trap card in dangerous situations.
My room also had a bookshelf filled with storybooks and the like, a personal closet space heightened to hold all the clothing a rich heiress would need, a vanity that I would have to grow into, and a desk that, if I moved my pillow onto my chair, I could just barely reach. Something tells me this desk is where I'll spend a lot of my time.
My own room was the second-best place I was introduced to—the first being the library. The Malfoys have never been the most powerful wizards physically, or the richest, or the ones with the most talent, but generations of careful leadership have built up one of the greatest collections of tomes and scrolls in the world. The library was divided into three sections, only one of which I could access at such a young age. The first and least restricted section was information on various magical fields that didn't require a wand. A small child reading about wizarding art might be bored, but trying to test what they had seen wouldn't result in their pancreas and liver being swapped. There were dictionaries of potion ingredients, rare books on arithmancy, various how-to guides that one Malfoy had picked up a hundred years ago for whatever reason, and anything else a Malfoy had accumulated over the years. The Malfoy family has always been a jack-of-all-trades situation. They might not have super in-depth knowledge in one area like the Ollivanders with their work on wands, but they had been around long enough to acquire information on many subjects. Five hundred years ago, a certain Licinius Malfoy was apprenticed at Ollivanders due to his close relationship with Aric Ollivander. He ended up marrying Aric's sister, and through this, a few priceless books on ancient wand creation ended up in the library. There were many potion masters, artificers, herbalists, duelists, and every other wizarding profession under the sun. Pupienus Malfoy was even a pioneer in magical archaeology after he discovered a group of Muggle archaeologists who broke into his Egyptian holdings. The ancestor who might be the most helpful to me, however, was Gallienus Malfoy. He was most likely insane, with a complete distrust of almost every other wizard, house-elf, goblin, and even owls. He bought a massive collection of how-to books from whatever wizards managed to make him trust them. There's "Cooking with Magic," "Wizard's Guide to Basic Carpentry," a book on magical cleaning, another on magical knitting and crocheting, an almanac on weather predictions, books on magical cartography, and even enchanted instruments. A lot of these titles might sound useless, but the amount you can gain from just one is incredible. There were also books on magical theory and even other languages used in magic, such as Greek, Latin, and runic scripts.
The second section of the library was almost as large as the first, but this was dedicated to the various branches and disciplines of casting. My parents had put a magical lock on the shelves, making them off-limits until I could either break the lock without them knowing—which would be incredibly difficult—or they decided to give me access, which would also be incredibly difficult to accomplish. I have thought of a few ways to try and break the lock by copying Father or Mother's magical biometrics, but that is a long way off. This section of the library would likely only be fully open for my use when I became old enough.
The final section of the library was black magic, ritual magic, and everything else illegal in wizarding society. The only way to enter was through a complex process that only my father and mother were aware of. If asked by any of the magical law enforcement, I would simply say there is no third section. The thing about black magic is that it apparently corrupts the soul and is incredibly dangerous for both the user and the people it is used against. The weird part to me is that it is possible to kill another wizard with any number of minor charms that wouldn't have the same corruptive effects. I have no understanding of ritual magic yet, but as long as it doesn't require human sacrifices, I may try to attempt something related, but that is a pipe dream. I might be open to human sacrifice if it was a convicted murderer; I think this family is changing the way that I think.
At the dinner table, my mother used the spell "Aguamenti '' to fill a cup with water. I asked her if she could make the water go faster and thinner. My mother said it would be possible with a few calculations, and though it might take a few tries, she would easily be able to do it. Based on what I learned there, if I could pressurize the water using magic and send it through with precision, I might be able to mimic a water cutter that sends water out at speeds similar to Mach 3. At these high velocities, the water stream possesses significant kinetic energy, which, when directed at a material, has an erosive force strong enough to cut through it. This would already be powerful, but if I could add garnet or another abrasive material, I could cut through tool steel and titanium at a speed that would appear instantaneous to those unprepared. From what my father said, Dumbledore could wandlessly cast all sorts of complex spells. If I could reach a point where I could remove the initial movements from this spell, I would have a sword/gun-like weapon that could kill people from a distance where they couldn't even see me.
This spell is a complete pipe dream at this point. The amount of magic needed for something like this would be insane, not to mention finding a way to practice it without slicing buildings in half. I think I finally realize how dangerous magic can be when given to someone with ambition, an understanding of technology, and future knowledge. I think wizards everywhere should be praising Merlin for that.
I wanted to show just how crazy magic could actually be in this world. I don't know if the water pressure insta kill button is going to make a reappearance and if it does it will probably be far into the future.