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Bone-brand
From Warhammer 40k - Lexicanum
The Bone-brand is a rare method of marking Chaos cultists with their cult affiliation sigils. Exactly how it is done is unknown outside the cults - even after prolonged research by the Inquisition - but the method etches a Chaos symbol (often the eight-pointed star) into the bone of the cultist's forehead, while leaving the skin and muscle above unblemished. This allows the cultist to remain invisible when moving among "normal" society, yet somehow remain recognisable to his fellow cultists.[1]
Source
- 1: Brothers of the Snake (Novel), Part Six, Chapter 6 - VI
