Wraithbone Structures (an exerpt)
The structures to be found across the ruin are constructed of a material known as Wraithbone. We believe this psychically resonant material to be the basis of most or all Eldar technology, from the simplest hand tools to the largest starship, from delicate runes to temples such as those found on Quppa-Psi-12, adheres closely to natural biological shapes and structures. To the Eldar, there may be no real difference between technology and nature. They are single process by which the Eldar imbue living things with function and functional things with life. The materials the Eldar use in their engineering are complex and varied psychoplastics that can be readily formed into solid shapes under psychic pressure. In some respects, they are more like living tissue than inert substances, growing and reacting to their environments in a similar way to plants. The completed device or structure is semi-organic machine or components that works in a conventional manner, though it is often operated by psychic means. The structures in this ruin are overrun with plant life, and many are damaged and decayed. Yet, the Wraithbone itself is a living thing, slowly repairing itself where a structure built by man would have crumbled to dust many millennia ago.
- Sharada Srinivasan, Imperial Remembrance Society, Exeter House, Scintilla