The consequences can be chaotic. It might lead to altered timelines. People could end up in the wrong era or at the wrong moment in history, changing the course of events in the wizarding world.
A Time - Turner fanfiction in the HG SS universe might involve Snape getting his hands on the Time - Turner. He could use it to go back and change some of his interactions with Lily, trying to prevent her from falling for James. This would create a whole new set of events and relationships, and the author could explore how the characters would adapt to these changes.
In some fanfictions, the Time - Turner might work in a similar way as in the original books. It allows the user to go back in time for a limited period, like a few hours. For example, a character could use it to redo a failed spell or prevent a small accident from happening at Hogwarts.
Sirius Black could be a trainer. Sirius, being Harry's godfather, would be highly motivated to train Harry. He could use the time - turner to go back to a time when he was at his peak in terms of combat skills and pass on his knowledge to Harry, especially in the areas of dark - wizard fighting and survival skills.
The Time Turner can completely change the plot by allowing characters to redo actions. For instance, if a character fails a mission in the original plot, with the Time Turner, they can go back and try again, which might lead to a different outcome for the whole story.
Well, in some fanfictions, the Time Turner is used to go back and change the course of the wizarding wars. This often involves complex plots where characters have to be very careful not to disrupt the entire fabric of time. Some fictions also explore the idea of the Time Turner falling into the wrong hands and the chaos that ensues, like dark wizards using it to gain an unfair advantage in battles.
In certain fanfictions, the contamination of the Time - Turner could be due to improper handling or storage. For example, if it's placed near a powerful magical artifact that emits unstable magic, that magic could seep into the Time - Turner and contaminate it. This could lead to time - related chaos, like creating time loops that were not originally intended or sending people to the wrong time periods. Another possibility is that a character who doesn't fully understand the Time - Turner's mechanics tries to modify it, and in the process, they accidentally contaminate it with their own unskilled magic.
One great 'Harry Potter Time Turner' fanfic is 'Time's Ripple'. It offers a unique take on how the Time Turner could be used in different situations not explored in the original books. It's really engaging as it delves into the consequences of time travel in the wizarding world.
The fanfiction 'Time - Turner: Harry's Redemption' is quite good. Harry uses the Time - Turner to fix his mistakes from the past. He goes back and tries to make amends with those he has wronged, like Draco Malfoy, and in the process, changes the whole dynamic at Hogwarts.
Maybe in the fanfiction, Harry uses the Time - Turner to train with long - dead great wizards. He travels back in time to learn from Merlin himself. Merlin could teach Harry ancient and powerful magic that has been lost over the centuries. This would give Harry an edge in his fight against Voldemort and also expand his understanding of the wizarding world's history.