Obfuscation Engines
From Warhammer 40k - Lexicanum
The Obfuscation Engines are ancient techno-arcana devices, that are installed within the Adeptus Custodes warship Radiance.[1]
They are adapted from ancient Heresy-era technology, that inverts the Radiance's void shields when they are activated. This causes the warship to become an invisible blank to even the most powerful Augurs.[1]
Source
- 1: The Gate of Bones (Novel), Chapter 17