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One of the Rangers who had been killed was the Lone Ranger's brother, Tonto made a mask from his shirt for the Ranger to wear until they caught the gang (so that he wouldn't be recognised by Cavendish). After they caught the gang the ranger decided to keep wearing the mask until the West was free of crime. So, that is why the Lone Ranger wore a mask.
This mask was considered to be a Sith artifact that encouraged the wearers to slowly destroy themselves for greater power. The lost mask of Darth Nihilus was imbued with the dark energy of the Sith Lord, allowing any who wore the ghost-white mask the power to wield the Force as if they were an apprentice. The mask was inside a crate in the wreckage of a Dynamic-class freighter ship on the planet Volik.