"Valkyrie's Shadow" is a fan fiction kingdom builder set in the universe of Kugane Maruyama’s "Overlord". It chronicles the lives of natives in a fantasy world where beings of immense power from a game have been transmigrated, turning their reality on its head. The story follows the aftermath of the Battle of Katze Plains, with the Sorcerous Kingdom's banner flying over E-Rantel, signaling a new world order under the rule of Ainz Ooal Gown and his powerful servants. The narrative focuses on methodical storytelling, well-rounded kingdom building, and character development, exploring the perspectives of the natives in this altered reality.