5 Ravenclaw Tower and the Rowena's Riddle.

The Ravenclaw Tower is located on the west side of Hogwarts, the staircase leading up to the common room is located on the fifth floor near the library, and is the location of the Ravenclaw common room and dormitories.

The entrance to the common room is at the top of a spiral staircase and is a door without a doorknob or keyhole but a bronze knocker in the shape of an eagle. To enter the room, a person must answer a riddle asked by the eagle knocker; if they answer incorrectly, they must wait for someone else who gets it right. If the student is unlucky, some even stay locked out until morning unless otherwise discovered or allowed another shot at the riddle. No students from other houses will be permitted into Ravenclaw Tower.

In Ravenclaw, each student has their room, it's impressive as the tower is small. It must have extensive space expansion charms Harry thought as he sat on his bed.

Harry was very excited to find the Ravenclaw Library as it would make him one of the greatest wizards of all time and he required power to save himself from the Purple titan named Thanos.

Harry also wanted to find the reason behind his Parsletounge as he didn't have Voldemort's soul in him. Still, it was a great tool and Harry would not give up this power. It was said that there are very powerful healing spells in Parseltongue and he wishes to learn them. 

Harry then went to sleep

As the went by the story progressed Neville made a golden trio with Ron and Hermonie. Most of the story followed the canon so all the events occurred while Harry spent his days learning new spells and mastering the Hogwarts spells and his magical core training.

Harry took a deeper dive into the magical theory as he was further able to prove that magic is just an energy that Wizards can control and can cause the change into realities through it.

Magic doesn't break the law of physics it is like an external energy as it provides various ways to convert one thing into another.

As Harry studied his theory proved true as many arithmancy formulas could predict the result of spells it was just that maths required to solve more complex curses was not possible even with supercomputers till a few decades later.

Harry was able a learn almost every spell till the 5th year within a few months as he learned most first years didn't have a magical capacity stronger than an average adult.

He also started learning Artimency and runes as they would help him very much in the near future.

Harry knew that it was time to take his legacy back from the Weasley twins. One morning Hary found the twins in the kitchen."Fred, we need to talk?" Harry said. Both the twins were confused as to why Ravenclaw wished to meet them but still, they gave Harry a chance as he was not a Slytherin.

"I will get straight to the point I am the son of prongs and I want the Marauders map as it is the heirloom." Both looked conflicted but in the end, they gave the map to Harry as they knew only their son would know about the existence of the map as he never told anyone.

Harry promised to lend them the map if they required it. It lifted their mood.

A few weeks before Halloween Harry made his way to ROR. As he reached the 7th floor He walked back and forth with one thought in his mind to visit the Ravenclaw's Library.

Soon the door appeared and inside was a small hall at the end of the hall was a golden door with no handle and only a keyhole.

Harry knew it was the legendary library but it required a key. Soon some words appeared on the door and it said-

"In the depths where shadows sway, Beneath the moon's enchanting ray, A secret lies, submerged and still, Unlock it, seeker, if you will.

A glimmer 'midst the murky tide, A guardian fierce, its secrets hide, To find the key, you must dive deep, Where mermaids sing and secrets keep.

But heed this warning, brave and true, The key won't yield to just a few, For only those with courage vast, Shall claim the prize that lies amassed."

Harry was not surprised to this as he knew it wouldn't have been a easy task to find the room but he will do it.