Eidolon

An eidolon is the echo or memory of a being left over in The Dream, after the physical (soma) and spiritual (pneuma) components have been lost (typically due to death of the body). Eidolons are extremely susceptible to distortion by The Egregoric Force, and thus are not reliable depictions of the original person and information they provide should be viewed with some skepticism. Eidolons fade over time if they are not kept alive in the memories of living people - they eventually become little more than shadows, before disappearing entirely. Some Eidolons do persist in the living memory of the world, becoming legendary figures and even gods. These will frequently reattach to the physical and spiritual world, becoming the spirit of a particular place of object. One example of this is the eidolon of Hundaru of Telmun, which has become the genius loci of Hundaru's lighthouse on Menâme. Other eidolons may merge together, becoming persistent archetypes that hold the memories of many people who have died (albeit in a fragmented and distorted fashion). One notable example of a merged eidolon is Zai, from the island of Irlandia.
In some places, most notably the Biluzik Archipelago, the ascension of eidolons to local spirits and gods is more common. These islands are considered haunted by some, although eidolons are distinctly different from ghosts (who retain their spiritual essence after death).