New answers tagged lightsaber
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There is no reason given in any of the films for why Dark Side Users wield red blades (or indeed why any lightsaber is a particular colour), but supplementary canon does offer a couple of reasons. From the (Disney) Canon Wookieepedia page we have:
Kyber crystals were inherently attuned to the light side of the Force, and resisted any effort by dark-side ...
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