https://www.patreon.com/AdeptusRidiculous
https://www.adeptusridiculous.com/
https://twitter.com/AdRidiculous
https://orchideight.com/collections/adeptus-ridiculous
Spirit Stones are made out of psycho-receptive crystals called waystones, which are grown from something similar to Wraithbone. At the moment of the Eldar's death, the stone acts like a 'psychic trap', absorbing their psychic self and preventing it from entering the warp and being consumed by the nemesis of the Eldar race: Slaanesh.
Wraithbone is a psycho-plastic substance used by the Eldar for many different tasks, including the construction of buildings, ships and weapons.
Wraithbone is essentially solidified warp energy that is manipulated by a Bonesinger into any shape that is required. It is stronger than any known plasteel and harder to damage than adamantium, and will naturally repair itself, though the process can be sped up by a Bonesinger. Being created from the warp, Wraithbone has innate psychic abilities allowing it to be used as a communications pathway as well as structural support. It carries psychic energy much as a cable carrying current does, as well as containing psychic shields to protect the occupants from the warp.