Excalibur, written as "Sword of Oath and Victory", pronounced as "Ex-curry stick".
Legend has it that King Arthur of Britain, after the Sword in the Stone shattered, followed the guidance of the wizard Merlin and received the Holy Sword from the Lady of the Lake. Forged by elves in Avalon, the hilt is made entirely of gold, adorned with gemstones on the grip, and its blade slices through iron like clay, gleaming coldly.
Just like the Gryffindor's Sword forcibly "stored" in Hogwarts, the goblins of Gringotts have repeatedly declared publicly that this curry stick is actually the sword lost by the goblins, solemnly swearing and defending their claim to it—
Even though the sword hasn't appeared before the eyes of the world since the year 500 AD.
Of course, the big iron rod sparkling with golden light in the golem's hand has nothing to do with the legendary Holy Sword. The same goes for the female voice following a certain anime's style, it's just William playing with memes in his idle time, though the power of this sword is indeed formidable.
The heavy Stone Sword, enveloped in magic, smashed furiously onto the stone bricks where William had just been standing a second before, kicking up clouds of dust that obscured the spot where William had just retreated.
"..."
The stone figure, glowing with golden light, scanned the area silently, then forcefully pulled the Stone Sword out of the ground. The thick blade swept past in front of it, and in the next moment, a dull collision sound rang out as William was sent flying from the dust cloud, still clutching the Gryffindor's Sword swiped from the Headmaster's Office.
"Heh heh, got you good, didn't it?"
And on top of William's head, the dusty and even more worn-out Sorting Hat chuckled gleefully, gloating.
"Shut up, you sheath. I'm starting to regret bringing you out."
William sighed with some exasperation. That day when he secretly snuck into Dumbledore's office to grab the sword, the Sorting Hat insisted on tagging along, saying, 'Bored of staying in this office, already composed next year's new song, and that old Dumbledore doesn't pay much attention to it since he found a new muse...' That's what the hat said.
It sounded like a grieving widow whose husband is still around but she remained unfulfilled.
Logically, with a bunch of headmaster portraits keeping it company, it shouldn't feel that bored, probably it was just weary of this kind of life as the hat claimed.
Under the hat's guidance, William successfully bypassed the charm Dumbledore left on Gryffindor's Sword and slipped out of the office with the sword wrapped in the Sorting Hat—his original plan was that, even if there were any restrictions or charms, as long as he turned Fawkes against Dumbledore, the old man wouldn't be able to catch him.
But naturally, this method worked even better. William had been eyeing that sword for quite some time. Though those goblins lacked dignity, their craftsmanship was commendable.
The most crucial part is, wielding a magic wand in one hand and a long sword in the other is just so** handsome!
Moreover, throughout the entire school, except for Headmaster Jerald's portrait, no one knew the way to enter this Map Chamber. Even if Dumbledore knew the method, with William's enhancement, he couldn't enter without using a counter-spell powered by Ancient Magic.
So, William only relayed what could be said to Headmaster Jerald and Dumbledore, and there's virtually no chance old Dumbledore could find his way here.
And this place, even more secretive than the Room of Requirement, was perfect for William to conduct some new research.
For instance, this Rune Language statue with superb combat capabilities standing before him.
(Hmm... something like that)
Joints composed of Seik Crystals, body primarily of large Topaz stones (Topaz), every part "flowing" with golden Ancient Magical Text patterns, from the most common "Giant Strength," "Hard," "Move"... to the complex "Thunder," "Nether Fire," "Instant Death Curse"...
Yes, although holding a Great Sword, emanating golden light… what William crafted seems most proficient in the Dark Arts, thanks to that Inverted Divine Hall, William's Rune Language supplies have increased immeasurably compared to before. Discovering even one new word in this unpredictable Magical Rune language signifies enormous progress—
Not to mention the secret chamber under Zeus's feet, crawling with hundreds of square meters of intricate magical text.
Calling it a secret chamber, it feels more appropriate to call it a stele, with those "Gods" carving all sorts of things onto it with crudeness. Many rune languages, much like the relationship between "Levitating Spells" and "Wild Bull Summoning Spell", with slight variations, even just the curve of a bend can lead to vastly different effects.
Thus, just categorizing and summarizing those, William spent an entire week.
Now, he was having morning exercise with his first magical construct. From the current testings, without using those destructive curses, simple charms couldn't cause substantial damage. Moreover, even if The Blasting Curse was used, unless all magic cores of the golem were destroyed simultaneously, the "Repair" magic runes would quickly fix it—
For safety, while maintaining the best state of the magic flow circuit, William added the most cores he could.
Only a mere 34 of them, and the cores can even repair each other…
Hmm, should be foolproof?
Signaling the simplistic-minded golem to halt, William stowed away the Gryffindor's Sword, satisfied as he looked at the stone figure before him.
Having collected the rough combat data, he planned on throwing this creation into the Dream Game later, to give those younglings at the Duel Club a taste of real intensity. Naturally, not to mention Harry and those third years, even an Auror facing this thing would likely only dodge attacks while seeking a chance to escape. Facing it head-on is not something an average wizard can achieve.