The Eldar spirit stones are also called Waystones. A spirit stone is a small, seemingly precious stone carried on an Eldar's chest, used to save their souls from destruction by Slaanesh. At the moment of the Eldar's death the stone acts like a "psychic trap" absorbing his psychic self and preventing it from entering the Warp and being consumed by the great nemesis of the Eldar race: Slaanesh. The Waystone can then be brought back to the Eldar's own Craftworld and embedded into its wraithbone core, where it will grow into a larger spirit stone. Once the stone is implanted, the individual Eldar's soul it contains can travel freely through the wraithbone, mingling with other Eldar souls and forming part of the communal spirit of the Craftworld itself. All the souls within a Craftworld collectively exist within the Infinity Circuit. In times of dire need, the Eldar are also able to retrieve the spirit stones of long dead Eldar heroes and place them into the artificial bodies of Wraithguards and Wraithlords. These constructs are then piloted by the Eldar soul, which experiences reality as a dream. This process is considered necromancy in Eldar culture and only done as a last resort. The Eldar Warlocks who specialize in this process are known as Spiritseers. Iyanden is an Eldar Craftworld with a very small population following an assault by the Tyranid Hive Fleet Kraken and is known for its greater use of these Eldar "living dead."
It is believed that when enough Eldar souls have been gathered within the Infinity Circuits of the Craftworlds, a new god will emerge; Ynnead, the Eldar God of the Dead. It is hoped by Farseers that this new god will be powerful enough to vanquish Slaanesh, freeing the Eldar from their doom at the Prince of Pleasure's grasping hands.
Spirit stones are also an Eldar vehicle upgrade which allows the Eldar's spirit to control the vehicle in case the pilots are incapacitated, in a similar way to the Power of the Machine Spirit.
There is one primary source of spirit stones: the old Eldar homeworlds that lie within the boundaries of the Eye of Terror and are now known as the Crone Worlds. Acquiring new spirit stones is extremely dangerous because the Crone Worlds exist within the Eye of Terror. In Eldar mythology the spirit stones were created by the Eldar god Vaul from the Tears of Isha. This tale is taken as a metaphor by the Eldar for the crystallization of the psychic energies of the Eye of Terror into the spirit stones.
Notes
The graphic novel Daemonifuge features the spirit stones only passingly, but names them Soul Stones instead. However, the Eldar Codexes name them as Spirit Stones. It is not known exactly what happens when a Spirit Stone is destroyed, but one can guess that the soul within is lost to Slaanesh. Also of note is that in the novel Dawn of War, a Spirit Stone is smashed by a Power Axe, resulting in an incredibly loud metallic ringing, and then an explosion that not only destoyed the Power Axe, but also sent Trythos, the Space Marine wielding it, flying a few metres away, thus undicating that spirit stones are a potent source of energy.
Sources
- Codex: Eldar (2nd Edition)
- Codex: Craftworld Eldar (3rd Edition)
- Codex: Eldar (4th Edition)
- Warhammer 40,000: Wargear
- Warhammer 40,000: Compilation