文字忍受者

In 742M41, Explorator Archmagos Umbra Malygris and hundreds of his Adepts go renegade after clashing with the High Fabricator of the Lathes in the Calixis Sector. He unleashed a number of forbidden weapons against seemingly random opponents to further his research and gain secrets from vanquished foes. The Mechanicus Dragon Secutarii destroyed him in 770M41, but his lore still plagues the Mechanicus.