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'''Dreamstones''' are talismans grown by the [[Eldar]] in the heart of [[Craftworld]] [[Ulthwé]]{{Fn|1a}} from the same material as [[Waystone]]s.{{Fn|1b}} They are used by the Eldar to guard their minds from [[Slaanesh]] when they sleep, but they as they absorb emanations from the [[Warp]], they are one of the few things known to protect [[human]] minds from [[Chaos]]. As a result, they pure Dreamstones are extremely valuable in the [[Imperium]], and are used by [[Navigators]] to prevent the dreadful nightmares that can occur after too much exposure to the Warp, as well as by human Sorcerers, Alchemists, and [[Inquisitor]]s,{{Fn|1c}} and are coveted by collectors.{{Fn|1d}}