Strands of Time

The final battle doesn't go as planned. At the moment of victory, time sand is thrown onto the dueling pair and Harry wakes up in Tom Riddle's Hogwarts, with no way of getting back. He must find a way to return to his time, all while fending off Riddle's suspicions and amid the threat of Grindelwald's powerful army, whose leader seems to have a horribly familiar fixation with him.