Sophia Riyeko is the head of the head of the Legatus division of the Corpus Branch of the Vitores Tenebras. A former student of Ahtar Delcon, Riyeko turned her back on the Imperium after Delcons harsh treatment of her after she was revealed to be a pysker. Her admiration for radical inquisitor Cutler Kar inspired her to join the Luminus Cabal, and defected to the Vitores Tenebras with ease. Riyeko officially is only the leader of the Legatus branch, but due to Kars idle nature she manages matters within the branch, often coming into conflict with Dorianus Ven Adrien due to her utter loyalty to Kar.