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Wraithbone is essentially solidified [[warp]] energy which 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.¹ 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.

Wraithbone emits a sympathetic psychic signal that Eldar can lock onto and use to control the object. Generally, Eldar buildings have a flowing form and lack any harsh angles. It is also used to make Eldar Runes.