Time-Turners are a decivce that is easily capable of time-travel. A Time-Turner strongly resembles an hourglass on a necklace, and the number of times someone turns the hourglass corresponds to the exact number of hours one wants to travel back in time.

It is extremely and vitally important that the user of a Time-Turner is not to be seen by past or future versions of themselves unless, of course, said versions are aware of their usage of a Time-Turner.

A possible scenario is a Wizard or Witch killing their past or future selves by surefire mistake.

At her Third Year at Hogwarts, Hermione Granger owned a Time-Turner until the end of the year, where she turned it back in to Professor Minerva McGonagall.

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