Shadows of the Past || Theseus Scamander

(Formerly known as Constellation).

Five years after the Battle of Hogwarts, Claire Black, a brilliant and fiercely dedicated Auror, has retired from frontline missions. But when a cryptic message arrives from the late Albus Dumbledore-her mentor and friend-she learns that one final mission awaits her. A dark magical artifact has been lost to time, and the only way to stop it from falling into the wrong hands is to travel back to the 1920s.

Stepping into the past, Claire must navigate the magical world she has only read about in history books, encountering familiar faces before their time-most importantly, the legendary Head Auror, Theseus Scamander. But the mission that seemed straightforward becomes dangerously complicated as Claire realizes that changing history is far more perilous than she ever imagined-and so is falling for a man she is not supposed to know.

Harry Potter universe
Just after COG - SOD

This is rated mature for a reason. Explicit language and death will be prevalent throughout the story. 18+ and if not then please read responsibly.

Also posted on Archive of our Own under the same username.