Excalibur (real)

Excalibur, also called Caliburn, is a legendary sword that Merlin had, the sword of Earth.

It is called the sword of origins.

Powers
Returning to Origins: The sword Excalibur is supposedly able to turn things backward in evolution, or in stages of change

Dispelling Enchantments: The sword Excalibur can supposedly dispel enchantments, though this could be considered similar to turning backward in stages of change as enchantments are not there, and then they are, so the power of the sword would revert them

User
It is unknown whether there were others who used it, but it is known it was created by the legendary wizard Merlin and lost in the Wildlandes.

A false copy of it was made by Angeline.

Trivia

 * This is based on the Arthurian legend sword of the same name