Lumni-spice was the rarest form of spice in the galaxy. It was found on several worlds, usually protected by Dragon Slugs, who consumed it. Planets that boasted the rare fungal growth included Hoth and Corulag[source?]. It was apparently extracted from Lumni lichen.
Shortly before the Alliance to Restore the Republic constructed Echo Base on Hoth, the pirate Raskar, lured by Han Solo, discovered and attempted to seize a cache of lumni-spice from a deep fissure near the planet's equator, reaching hundreds of meters towards the planet's core. He was chased away by a Dragon Slug.
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- The Essential Atlas