Ilum was an ice planet in the Unknown Regions of the Galaxy. It's mostly known for it's cavern caves that have blue and green crystals that could be used for lightsabers.
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Ilum is a cold icy world with no known settlements. Ilum crystals used in the building of Jedilightsabers can be found in Ilum's Crystal Cave. The crystals grow in intricate formations and glow in the dark cave. Unlike lightsaber crystals found elsewhere, Ilum crystals only produce blue and green blades.