Over the course of Harry's stay in the House of Black, he has learned many things, as have its residents. While Harry marvels at their ingenuity, as his other cousins mentioned before going here, it has been an eye-opener seeing it performed in person—such fascinating usage of the Mist by those mortals, or rather wizards, as they called themselves. The residents, likewise, were in awe as Harry showed an outstanding aptitude in terms of magic. His mastery of water has never before been seen. It was a spectacular scene where it seemed the water was part of his limbs. This further strengthens their belief that he receives guidance from one of, if not the most powerful, wizarding families in the US. His usage of wandless magic and its strength still amaze them, which made him the apple of the eye for the twins residing together with him, much to the liking of everyone around them. Sarcasm could be noted.
Harry has his fair share of troublesome twins, and the Weasley twins definitely don't lose out to them. If their pranks before they met Harry could leave them boiling in anger, now that Harry has joined their team, it has left the people around them miserable and exasperated. If not for the ward surrounding the place, people passing by would certainly hear a scream as well as some things being thrown and broken from time to time.
"You three again! One more prank, and I swear I'll jinx you for good this time." Molly's voice lazed with venom as she threatened the three kneeling people in front of them, contrary to the atmosphere of those people when they saw the pranks happen. Sirius and Remus were holding themselves hard, trying not to laugh at the three's misfortune, which earned them a snort from the people who happened to be the subject of such pranks. They remember what they are laughing at—their era, the Marauders—and they too have heard of it. With one more hard glare at the three, causing the twins and Harry to flinch, she left the living room. Hermoine, Remus, and Sirius followed after her, trying to help and hoping to calm Molly down. This has been a common occurrence since Harry stayed with the twins during his stay. Most people wished it would be the last. However, they knew it wouldn't exactly be so and certainly wouldn't be the last of it. As hard as it may be, they just accepted it as it is. After all, they would miss the noise once the semester started.
"What time are we going to fetch our supplies tomorrow?" asked Ron as he glanced slightly at Sirius before eventually landing on her mother. "We will go tomorrow morning. We will head first to Gringotts to withdraw some funds before we buy all your supplies needed for the semester." Molly started before she directed her attention to Harry and continued, "Harry dear, have you asked your Uncle Nico or your father if they will let you go with them at Hogwarts to further your studies? I know you're already as powerful as the people in the Order, but knowledge is still indispensable. It is not wrong to learn and gain more. Besides, Dumbledore already committed to letting Minerva and Severus tutor you. You won't be in danger there."
"Yes. My mother already agreed to let me attend school." Harry grumbled, much to his liking. If her mother saw him like this, she would definitely think she was looking at her husband's younger self. The resemblance is very striking. And knowing it, she would still smack his head because of this very reason. Both husband and son are like two peas in a pod, but on a different timeline. They avoid lessons as much as possible, but they are nonetheless street smart, and she loves them both dearly.
The people around the table beamed when they heard it but grumbled the next second while looking suspiciously at the seemingly uninterested twins. They could only curse and brace themselves, and somehow they felt pity for the incoming disaster. The only consolation they have is that they have already graduated from the pranks, while others are going to have a blast, which might be literal as well. Not long after, they have finished their meal and proceed to their respective quarters to rest, recharging for what's to come the following day on their journey to Diagon Alley.
The morning comes closer than expected, especially when everyone is anticipating a busy schedule ahead. They have gathered in the living room right after breakfast, ready for 'battle' considering the start of classes the next day, and they could already foresee the crowd when they arrive, and sure enough, their anticipation did not fail them. The Weasley siblings and Hermoine gawk in wonder—even though they have been there already from previous years, they still cannot stop themselves from admiring it, much less Harry, who's here for the first time.
From the entrance, the wall went into a small hole at first but soon formed a large archway leading to a somewhat market-like place. Inside the alley were an assortment of restaurants, shops, and other sights new to Harry. Some even had tables out front with colored umbrellas. It was packed with witches and wizards of all ages, going in and out of varying locations and shopping for various goods. Animals can be seen traversing along with wizards, in particular the owls, as they flap their wings and soar in the sky, carrying goods of different sizes. As they walked, Harry's head was looking left and right in amusement, his eyes gleaming. When he first arrived in London, he already saw many owls, but those seemed sparse compared to what he could see in front of him. He thought to himself that his grandma doesn't seem to mind them, considering it is her sacred animal, and he usually takes offense when someone—his father, or rather anyone from the side of the family—accidentally injures it in the wild. He has to commend the boldness of these wizards.
Looking ahead, he can see an imposing, snow-white, multi-story marble building that towers over the neighboring shops. From what he can incur so far, it should be the wizarding bank—Gringotts, the place where witches and wizards stored their money and other valuables in heavily guarded vaults miles below ground. From what Hermoine said, one would have to be mad to try to rob Gringotts, and that, apart from Hogwarts School of Witchcraft and Wizardry, where he is supposed to further his studies, it was the safest place for anything valuable to be kept. Goblins were so greedy and would protect their money and valuables at any cost, which made them ideal guardians for the valuables of the wizarding world. He agreed with that apt description regarding goblins. He had encountered one before—it was an annoying bunch.
As they approached, a set of white stairs led up to a set of burnished bronze doors. Harry could see a goblin guarding the entrance, wearing a scarlet and gold uniform, twitch its nose as if smelling something. Following the smell, it looked at him straight in the eyes, as if it recalled something and was about to open its mouth, but hesitated and ignored him after a few seconds, which Harry found weird but did not further indulge as he followed his group to the entrance to Gringotts, which led into a small entrance hall and another set of doors. Engraved on these silver doors were the words:
Enter, stranger, but take heed.
Of what awaits the sin of greed
For those who take but do not earn,
Must pay most dearly in their turn.
So if you seek beneath our floors,
A treasure that was never yours,
Thief, you have been warned; beware.
Of finding more than treasure there.
Another group of goblins can be seen after entering the hall. It was a vast marble hall with long counters stretching along its length and doors leading off to what seemed to be vault passageways with around a hundred goblins sitting at them. The Weasleys went to one of the counters for their withdrawal.
Not long after they left, a goblin who seemed to be of higher status approached him, then bowed. This gesture did not escape the Weasleys, as well as Remus, who is with him. "I am Gringotts' Head Goblin. I welcome you to our establishment. I have been informed of your arrival. You are here to withdraw, correct? Do you have their keys?" the Head Goblin asked, to which Harry responded dumbly, "Uhm" before coming back to himself as he rummaged through his bag, trying to locate the badge his Uncle Nico left him that night. It took him a few minutes before he pulled out an ancient-looking golden badge—to be precise, a golden drachma—but what distinguished it from the others was the three-tipped spear on it—a trident was engraved on it, the symbol of his grandfather and father. The moment the drachma was pulled out, the entire hall seemed to come to an abrupt halt. The immediate silence is deafening as pressure descends for a moment, making time seem to stop for a moment. But to Harry, it smelled like the familiar smell of a warm ocean breeze—just like his father, as fast as it appears, it quickly dissipates.
Harry looked at the Head Goblin, and noticed that it looked at him grimly. It took a deep breath and asked him to follow him closely as he was led towards the doors at the end of the hall, where the Weasleys were waiting for him, albeit looking at him differently, but no one said anything to him.
The Head Goblin called a few more goblins, then led the way towards the door, where the guards opened it for them to go inside. In contrast to the grand marble of the entryway and the main hall, the passageways to the vaults were stone and dimly lit with flaming torches. Harry can see tracks with several little carts positioned on top of them. They hopped into one, and Harry could see that the track sloped down. The goblin started the carts and took them deep beneath the surface of the earth, through a maze of twisting passages, to the vaults. A few minutes later, they stopped, and Harry saw the Weasleys hop out of their cart. Harry followed suit.
"Gringotts used a variety of security systems." Remus started to explain before continuing. "Most lower security vaults required a key, while higher security vaults required the touch of a certified Gringotts goblin. Higher security vaults might have various enchantments upon the doors. If anyone but a Gringotts goblin touched the door, the person would be sucked into the vault, which was checked for trapped thieves about once per decade. This, and the fact that visitors must travel in the mine carts to access the vaults, strongly suggest that there were Anti-Apparition Charms around the bank."
"Harry dear, this is our family's vault." Molly explained kindly. There was a slight blush on her cheeks as she heard Remus' explanation, although she knew he meant no harm. Harry checked his surroundings and noticed that their vault seemed to have fewer security measures. Harry followed the siblings as Molly opened their vault. The vault contained only a small pile of sickles and a single galleon, all of which Molly Weasley took out. Harry heard Molly's sigh as she headed back to their carts.
The carts started once again, however, much faster this time as they went to the slope. The ride was queasy and went very quickly, which prevented its occupants from getting a good look at their surroundings. It seemed to run on a vaster, more complex, and interconnected series of tracks that allowed them to move to and between vaults as they moved deeper. Harry also noticed that as they went deeper, the vaults became smaller than the surface. It took them a few good minutes until they reached Harry's vault, which seemed to be quite near the end as well. Harry felt a sudden sense of nostalgia after the ride, just like when he was on his father's steed.
Harry saw an enormous door, plated with gold, with engravings of a winged horse with a man on its back who's holding a trident above his head. Unknowingly, Harry stared at the man, who has an uncanny resemblance to his father. The engraving's head suddenly stared down, seemingly looking at him from afar. His surroundings slowly melted, turning into a mist. When he came back to his bearing, he saw himself in front of a man and a woman, who were holding each other and looking while smiling lovingly at him. He knows that his father summoned him.