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Etherium
From Warhammer 40k - Lexicanum
Etherium is a highly advanced form of Aegis Armour built into the Synskin of Officio Assassinorum Culexus Assassins. This, combined with the Culexus's innate Pariah abilities, means that psychic attacks pass right through him as if he were invisible.[1]
Sources
- 1: Codex: Assassins (2nd Edition), pg. 22