Faction Paradox members wore their armour to diplomatic meetings and sometimes in battle. The armour was purported to be made from the skeletons of Great House agents from a timeline where they lost the war against the Yssgaroth, and were tainted by it. This irritated the Houses not only because it was an emblem of their failure, but because the Houses insisted that alternative timelines did not exist at all.
According to The Book of the War, all Faction armour originated in the "abomination's graveyard" found by the original Godfather-lieutenants. However, different species were represented in the graveyard, so particular cliques and Cousins often used variant armour. The Military Wing in the Eleven-Day Empire used simpler armour which left the face clear, apparently taken from a different species. Cousin Belial wore a tusked, mammoth-like headpiece. (PROSE: The Book of the War) Cousin Shuncucker wore armour which she claimed came from a leviathan. (AUDIO: Movers) Godfather Christèmas wore a narwhal skull. (PROSE: Weapons Grade Snake Oil)