The Dumbledore's Army use the Room of the Requirement to get themselves a spaceship.(Knowledge about Stargate is not necessary to read this story)
Site: Archive of Our Own | Fandoms: Harry Potter - J. K. Rowling, Stargate - All Series | Published: 2015-02-22 | Completed: 2015-02-27 | Words: 30914 | Chapters: 10/10 | Comments: 248 | Kudos: 1130 | Bookmarks: 339 | Hits: 18670 | ID: 3412346 | Download: EPUB or MOBI
Magicks of the Arcane by Eilyfe
Sometimes, all it takes to rise to greatness is a helping hand, the incentive to survive. And thrust between giants Harry has no choice but become one himself if he wants to keep on breathing. He might've found a way, but life's never that easy. Clock's ticking, Harry. Learn fast now.
Site: fanfiction.net | Category: Harry Potter | Rated: Fiction M | Chapters: 35 | Words: 252,722 | Reviews: 1,638 | Favs: 4,240 | Follows: 4,511 | Updated: 1/18 | Published: 7/9/2012 | id: 8303194 | Language: English | Genre: Adventure | Characters: Harry P., Albus D. | Download: EPUB or MOBI
Some men live their whole lives at peace and are content. Others are born with an unquenchable fire and change the world forever. Inspired by the rise of Napoleon, Augustus, Nobunaga, and T'sao T'sao. Very AU.
Site: fanfiction.net | Category: Harry Potter | Rated: Fiction M | Chapters: 43 | Words: 629,567 | Reviews: 1,768 | Favs: 2,688 | Follows: 2,424 | Updated: 1/13 | Published: 4/17/2010 | id: 5904185 | Language: English | Genre: Adventure | Characters: Harry P. | Download: EPUB or MOBI
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