Inquisitor Zonei Mashtishaddu is an enigma, a man completely hidden by the respirator mask and robes he wears to keep him alive after the wasting disease that wiped out most of his homeworld of Blight III. Since his discovery by the Imperium, the Adeptus Mechanicus has miniaturised his life support system enough that he could take the work of the One and the Twelve into the shadows of the Imperium, beginning with a short apprenticeship under Inquisitrix Ai Osamu. As he was already a mature psyker before, he achieved the rosette quickly.
Although his true face is hidden, Mashtishaddu bears the personae of both an expert techno-artificer and a powerful soul-psyker. He and his compatriots can bring little sheer might to a conflict themselves, but he maintains relationships with the Recongregator and Istvaanian factions, the Xenarite Techpriests, and the Adeptus Astartes Doom Glaives.