Fics like A (not so) Young Ainu's War upon Middle-Earth

Forced to become a servant of her most hated foe, a young Maia of Aulë seeks to impose order on a chaotic world shaped by divine will and dares to subvert destiny with cold rationality alone.

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1. On a Pale Horse by WrandmWaffles (幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), ウマ娘 プリティーダービー | Uma Musume: Pretty Derby (Anime), more)
2. A Young Woman's Inevitable Dance of the Dragons by Failninjaninja (Game of Thrones (TV), A Song of Ice and Fire - George R. R. Martin, more)
3. A Young Girl's Game of Thrones by Failninjaninja (Game of Thrones (TV), A Song of Ice and Fire - George R. R. Martin, more)
4. The Saga of Tanya the Ghastly by grocamol (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
5. The Chronicles of Tanya the Fuehrer by WileyC (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
6. All That Is Gold Does Not Glitter by XenoWrites (Halo (Video Games) & Related Fandoms, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), more)
7. Tanya's Defiance of the Fall by Failninjaninja (幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
8. A Young Warg's Game of Thrones by Failninjaninja (幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
9. All That Is Gold by PlainRebeccaJane (Harry Potter - J. K. Rowling, The Lord of the Rings - All Media Types, more)
10. A Young Woman's Defense of the Inner Sphere by Failninjaninja (幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), Classic Battletech (Tabletop RPG), more)
11. Living under Mom by grocamol (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
12. A Young Woman’s Riftwar by Failninjaninja (The Riftwar Saga - Raymond E. Feist, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), more)
13. The Calculus of Harmony by MarkofArtemis (My Little Pony Generation 4: Friendship is Magic (Cartoon 2010), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
14. I Thought This Was Isekai Quartet, So Why Are We Watching Re:Zero?! by Hotaru12 (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), この素晴らしい世界に祝福を! | KonoSuba: God's Blessing on this Wonderful World! - All Media Types, more)
15. When the World Falls, the Devil Becomes an Angel by KsiadzRobak21 (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)
16. A Young Girls Containment by Bobify (SCP Foundation, 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), more)
17. A Young Girl's Delight: The Stations of Kanon by RHoldhous (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil - Carlo Zen (Light Novels), more)
18. The Fox Hole by StarWaves (Highschool DxD (Anime), Harry Potter - J. K. Rowling, more)
19. A Young Girl's Delinquency Record by GremlinJack (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga))
20. A young girl's saga of symbiotes by grocamol (幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Anime), 幼女戦記 | Youjo Senki | Saga of Tanya the Evil (Manga), more)