Sirius led Harry and the others to the eighth floor of the castle.
The group gathered outside a wall. Having never visited the Room of Requirement, they all looked at the wall before them with puzzled expressions.
"David, is there a secret passage here?"
"This doesn't look anything like a secret passage."
"It's clean, neat, and extremely solid."
Draco Malfoy patted the wall, utterly bewildered.
He even briefly suspected that Sirius was playing a joke on them.
"There is a place at Hogwarts that is as magical and legendary as the secret passages."
"I've never been through the secret passages, but I have entered the Room of Requirement."
Sirius said calmly and confidently, "When we need it, it will appear before us. And whenever it appears, it always perfectly meets our needs."
"Now, think with me about a room that secretly holds Ravenclaw's Diadem."
Sirius closed his eyes, a pressing need filling his mind.
Seeing this, Harry, Hermione Granger, Cedric, and the others could only follow suit and imagine their need to find Ravenclaw's Diadem.
When they opened their eyes, an exceptionally smooth door had appeared before them.
"Oh my God, it's real?"
"This is the Room of Requirement?"
"A door really appeared."
"The Marauder's Map really doesn't show this door."
Harry and the others stared at the door before them in amazement.
Harry Potter took the opportunity to pull out the Marauder's Map and compare it.
Looking at the Room of Requirement before him, Sirius recalled his school days.
After discovering the Room of Requirement, they had often come here to hide and hold their secret meetings.
"Let's go in."
Sirius walked ahead and spoke to Harry Potter and the others.
The group entered the Room of Requirement, and what met their eyes was a vast space filled