A Sempiternal Weave is an advanced form of Necron technology used to augment the Necrodermis bodies of Necron royalty like Necron Overlords, Necron Lords and Necron Destroyer Lords. A Sempiternal Weave threads a Necron’s exoskeleton with filaments of phase-hardened amaranthite and adamantium, vastly increasing the body’s structural integrity to a level that rivals that of Astartes Terminator Armour.
- Black Crusade: The Tome of Fate (RPG), pg. 121
- Codex: Necrons (5th Edition), pp. 82, 89-90