Star Wars: Battlefront 2
Well he used two when fighting, but I think he had two more in reserve. Making that four lightsabers.
He used 2 or 4 in combat, depending on who he was fighting, but he owned a total of at least 9 sabers.
Darth Sidious, Palpatine. Used Force Lightning to blast him off a really high building. Revenge of the Sith.
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