Merlin's Scroll

Merlin Scroll is an ancient spell written by the great wizard, Merlin, as a device to help his son, Niall Oldman, return to his own time.

History
Merlin wrote this scroll with a time traveling spell after Prue and Piper Halliwell came to him to tell him about his son, who had been summoned to the future and had no way of returning to his own time.

After using the spell, Niall kept the scroll until it became lost. The evil druid, Diana Jones, found it and kept it for herself. Niall from a slightly earlier time knew of the scroll, but failed to find it, Diana then burned it in front of Niall and the Charmed Ones. However, by going back in time, Prue and Piper brought Niall the scroll and allowed him to go back to his own time, thereby preserving history.