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Stygium Crystal

Stygium crystals came from a crystalline material only found on the planet of Aeten II. The Jedi discovered that once purified, this crystal made a suitable focusing crystal in the construction of a lightsaber.

At the height of the Empire's reign, Sienar Advanced Projects of Sienar Design Systems discovered that Stygium crystal's could be used to perfect cloaking technology that could defeat the security and sensors of capital starships.