A Shadowloom is a defensive Necron device, which consists of a scarab-sized generator only ever mounted on Tomb Blades. A Shadowloom can project an aura of unnatural darkness around the Tomb Blade, providing mobile cover within which the craft can disguise its approach and throw off the aim of its foes.
- Codex: Necrons (5th Edition), pg. 42
- Codex: Necrons (7th Edition) (Digital Edition), pg. 209