Staff of Sacanas

The Staff of Sacanas is the scepter that was used by the Storm King, the main antagonist from the 2017 animated film, My Little Pony: The Movie.

Role in the Movie
The origin of the Staff of Sacanas is unknown. What is known is that it was apparently hidden in a secret location until the Storm King found it with Tempest Shadow's help. They then plotted to use the staff to absorb the magic of the Alicorn princesses of Equestria and make it all-powerful so that the Storm King could create powerful storms and rule the world.

When the staff appears, the Storm King wanted to steal the alicorn magic to create the powerful storms. Tempest Shadow tells him it will channel the four princesses magic making it more powerful. Therefore the Storm King tasks Tempest delivering Twilight Sparkle within 3 days in exchange for restoring her broken horn. Eventually Tempest captures Twilight and brings her to Canterlot.

Under his control, the staff gave the Storm King nearly "infinite" control over weather, allowing him to effortlessly creating massive storms. He also realizes he respectively has control over the sun and moon and then uses it to create a powerful cyclone.

The Storm King arrives and uses the Staff to steal the magic of all four princesses of Equestria.

Twilight managed to wrestle the staff from his hands in order to save Equestria from his clutches and restore the other princesses of Equestria.

In an alternate universe, Princess Eris received the staff as well. She managed to absorb the powers of Princess Luna and claimed she would sell the staff at an auction, allowing whatever villain who wanted it to do whatever they wished with it.