Harry Potter: Ero World

{Outside the Lavatory, Second Floor, Hogwarts}

{13th Oct 1991} 

{3rd person POV}

The wall was quite clear, but something could also be hidden by magic, even if he couldn't sense anything. Rigel was afraid that the heir had decided to strike early. He was hoping that the world would follow its logic of starting the year's attacks on Halloween, but it seemed like it was a little too much to ask.

"Revelio~" Rigel waved his wand toward the wall. As expected, no message written in blood was hidden behind any magical veil.

"That's house-elf blood," Minerva spoke as she bent down to take a closer look. She waved her wand at the splotch and fired one wave of mana after another. Rigel watched her work, but his attention was now on the closed gates to the lavatory. He couldn't hear anything anymore. The voice of the giant snake was gone, but he didn't want to risk it. Seeing Minerva busy at work, he focused and thought back to the spell he had learned for this very day.

"Vocationis~" Rigel whispered as he pointed his wand at the walls. As expected, the spell failed to take hold as the mana from the runes and wards interfered with the spell-like before. For this very day, he had specifically been carrying a small, plain wooden box in his inventory. He pulled it out, his hands straining from the sudden weight as he placed it down on the ground.

"Vocationis~" He tried the spell again. This time, he could 'see' the magic take hold as the plain box became a music box.

"~Cock-a-doodle-do~" The sound filled the hall once before Rigel canceled the charm with a quick Finite. The spell worked in an emergency case, and that's what matters.

"What are you doing?" Minerva asked as she stood beside him. She was staring at the box.

"Just some precautions... if something happens, can you conjure a strong wall in front of us, something that can take a heavy beating against something like a Bomarda Maximus?" Rigel asked. 

Minerva opened her mouth, likely about to ask how he knew that spell, before she closed it and nodded. She wanted more information, but the way in which Rigel was taking precautions and getting ready, along with the information about the ancient monster hidden in the school by Slytherin, she decided against it. She could always grill him for information later.

So they both waited in front of the closed doors. In the beginning, it was nothing. He was quiet and patient when it came to the important stuff. He had no desire to rush in there early and duel a Voldemort-possessed student. But as time continued to tick by, first a minute, then ten, he was starting to fidget.

"Why don't you sta-" Minerva began, but exactly then, the doors were pushed open. Rigel didn't even wait to see who it was. As soon as he saw that the figure who walked out was humane, he whipped his wand at him/her.

"Stupefy~" Rigel shouted, carefully enunciating the spell as he started at the name after he had finished casting it.

...

[Theodore Nott Lv 4]

...

'Wait, Nott? He's the one on whom Lucius planted the diary?' Rigel thought.

"Mr. Black, what on Merlin's beard are you doing?" Minerva asked. Attacking a fellow student was a big no-no, especially in front of a teacher.

"It's okay, Professor. Just let me check if he has it or not," Rigel barely gave her a concrete reply as he swiftly walked close to Theodore's crumpled form. The spell had blasted him back as he landed in the lavatory he had just come out of. Thankfully, he didn't hear a murderous ancient snake, so he was safe to do so.

It was easy to spot the diary. It was lying beside him. The black leatherbound cover might not have been enough, and he couldn't sense any magic from the diary itself, not until he grabbed onto it. He could practically see a tendril of mana trying to connect with him as the compulsion charm to hide the diary away and write in it tried to get a hold of me.

Minerva was beside me, checking up on Theodore. Rigel let her deal with the knocked-out first year as he focused on the Diary itself.

...

[Tom Riddle's Diary (Legendary): Tom Marvolo Riddle enchanted his diary to write down his knowledge about magic and his experiences with it. The diary could answer any question related to the Hogwarts course and a bit beyond the curriculum.

The Diary's capabilities were enhanced when Tom Riddle turned it into a Horcrux, with the dark magic of the Horcrux influencing it and the memories of Tom Riddle itself stored in its piece of soul. The Diary could show anyone how to use a spell correctly and teach them magic; in exchange, it would possess anyone who dares to use it and slowly take over their soul.

+ 100% bonus to spell EXP.

+ Major Compulsion Enchancement.

+ Horcr$$#@$#@]

...

'...'

'Okay, so maybe it's not as broken as the Diadem, but it's clearly a good tool; unfortunately, the pros and cons of keeping it are too one-sided,' Rigel thought as he looked at the gold letters engraved onto the front of the Diary.

'''TOM MARVOLO RIDDLE'''

"Mr. Black, do you have an explanation before I march you to the headmaster's office and get you expelled?" Minerva threatened, and finally, Rigel looked away from the diary and straight into her eyes.

She stopped with her threats when she noticed the serious look on his face, and then she focused on his words, "You must know the Patronus charm, don't you, Professor? Why don't you call both the Headmaster and Professor Snape here? I think they both would like to know what happened here. Mentioning the fact that the Chamber of Secrets was opened would help. I promise I'll tell you everything I know then." 

She stared at him for a moment before she decided to give him the benefit of the doubt. Her face turned into a look of concentration before she enchanted, "Expecto Patronum~"

Rigel stared at the glowing white cat as it dived through the walls and disappeared from view.

'I need to learn the Patronus soon. With the Dementors around, I have put it off long enough.'

...

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AN - I guess Theo being the one with the diary was a little obvious?