The Undetectable Extension Charm has a very wide range of uses, for example:
Hermione's beaded handbag later on: it holds books, clothes, a tent, potions, Slytherin's locket, and Gryffindor's sword. This small bag plays a crucial role during Harry Potter, Ron Weasley, and Hermione's journey to hunt Horcruxes.
The tent the Weasleys live in later: from the outside it looks like a shabby two-person Muggle tent, but inside it's like an old-fashioned apartment with multiple bedrooms and a kitchen.
Mr. Weasley's Ford Anglia: Mr. Weasley admits he put a charm on his Ford Anglia so the inside has enough space to comfortably fit eight people, six large trunks, two owls, and a rat.
And of course, the most famous example is their alumnus Newt Scamander's suitcase:
Its interior is expanded into a vast space containing multiple ecosystems, used to house and care for various magical creatures.
Speaking of magical creatures…
On the third floor of the castle, Sean naturally made his way into the Headmaster's office.
Inside the spacious, beautiful circular room, the former headmasters' portraits were mostly dozing.
And he wasn't alone.
On a tall gilt perch behind the door stood a decrepit bird—like a turkey that had been half-plucked.
"Mr. Phoenix," Sean said, looking up at it.
At once, a clear humming note rang out in the room, like song.
Sean quietly fed Fawkes some herbs—daffodil petals, aconite root, and the like.
[You gained the closeness of the magical creature phoenix (Fawkes) to an apprentice standard. Closeness +1]
Hearing the panel's chime, Sean's feeding instantly became a lot more reverent.
Earning Fawkes's closeness was difficult. Even though Sean often "snuck" close to him, this was the first time he'd ever gotten any closeness at all.
Sean looked at him. The phoenix suddenly paused and fixed him with a mournful gaze, then made a choking, airless sound—
as if he were gravely ill.
Its eyes were dull, and while Sean watched, several more tail feathers drifted down.
When Sean finished feeding him, the phoenix abruptly burst into flames.
As though Sean's offering had killed him.
Sean finally understood why Mr. Fawkes had been happy.
At the same time, the phoenix had already become a fireball;
it gave a single shriek, then vanished—leaving only a heap of ash on the floor that wasn't quite extinguished yet.
"Terrifying…" Sean tried hard to look suitably frightened.
When he lowered his head, he saw a tiny, wrinkled chick poke its head out of the ashes—
then pecked angrily at Sean's robes,
as if accusing him of faking it too badly.
"Sorry, sir," Sean said.
[You gained the closeness of the magical creature phoenix (Fawkes) to an apprentice standard. Closeness +1]
Mr. Fawkes bobbed his small head and went back to eating.
The office door opened, and Dumbledore walked in, laughing under his breath.
"Good afternoon, Headmaster Dumbledore. Um… just now… your phoenix suddenly caught fire—"
Sean chose his words carefully.
"It seems it didn't even make you wonder, but I suppose it was about time. He's looked dreadful for days, and I've been telling him to get on with it.
"Mr. Green, I think you already know. Fawkes is a phoenix.
"When phoenixes are about to die, they burst into flame, and are reborn from the ashes. Just now you were watching him… he looked as ugly as any old bird.
"A pity you had to see him on a day of burning renewal," Dumbledore said as he sat down behind his desk.
"Most of the time, he's very beautiful:
"Brilliant red-and-gold feathers, quite marvelous. Phoenixes are strange, enchanting creatures.
"They can carry extremely heavy loads, their tears can heal wounds, and they are fiercely loyal companions."
Dumbledore spoke, then smiled at Sean. The young wizard's eyes were shining.
This child only ever reacted like this when magic was involved…
That sort of obsession—on this child—wasn't something you could simply dismiss.
Sean felt more and more that he should visit the Headmaster's office often.
Teleportation, carrying burdens, healing, revival…
Phoenixes possessed far too much incredible magic. Sean remembered that phoenixes were even unafraid of the Killing Curse.
Avada Kedavra could only "kill" them into one rebirth—resetting them back to a chick—because phoenixes do not truly die.
In the battle at the Department of Mysteries, Fawkes swallowed an Avada Kedavra whole.
Unfortunately…
Even now, after many visits to the Headmaster's office—and many secret feedings—Fawkes's closeness hadn't increased much at all.
Only a pitiful three points.
And Sean knew that for a creature like Fawkes, any ritual magic he tried to pioneer would be unprecedentedly complex.
Still, Sean had plenty of time—
and more importantly, he'd always been someone who could live with time.
When he left the Headmaster's office, the sky had turned a dull gray.
Christmas was right around the corner, but Sean still didn't know whether he'd be allowed to leave Hogwarts.
Meanwhile, back in the Headmaster's office…
"Albus. Christmas has come," Minerva McGonagall said, watching the snow fall outside the window as she handed over a leave request.
"Oh, of course. But—" Dumbledore seemed to imagine a mountain of paperwork, blinking once, "Severus has filed a detention request, and the duration is…"
"From September 1st to September 1st… no holidays, and… every year—nonsense!"
McGonagall's brow furrowed. She stared at Dumbledore, as though silently questioning how he could possibly approve something like that.
"Minnie, as for the 'holiday arrangements' of your… household… I really shouldn't interfere too much."
Dumbledore laced his fingers together and glanced at his desk, the curve of his smile widening…
He still had a whole dish of Lemon Drops and Cockroach Clusters.
McGonagall looked once more at the smiling Dumbledore and turned to head for the dungeons.
"I mean—why not wait a moment? Severus is on his way… about the Defence Against the Dark Arts post."
Dumbledore tried to stop her gently.
"You can't agree to it—it's not a good post," McGonagall said, startled.
At that moment, the door opened, and a black storm-cloud swept in.
The kettle in the Headmaster's office began to burble, and before long the circular room was filled with argument.
Then the mood slid into an uncanny silence.
And in that silence, Professor Tayra pushed the door open—beaming—as she entered.
~~~
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