Zadal Crosius
Zadal Crosius was an Apothecary in the Death Guard Legion who took part in the Horus Heresy's Siege of Terra.[1a]
History
During the conflict, he was among his Legion's forces that defended the seized Lion's Gate Space Port as the White Scars attempted to reclaim it.[1b] As they fought for the spaceport, Crosius proved his skills in rallying the Death Guard against the White Scars. After their Primarch Mortarion was banished into the Warp by Jaghatai Khan, however, Crosius used a nurgling he had been given by Typhus to contact the First Captain and have Typhus assume command of the Death Guard. Crosius then agreed to follow the First Captain afterward.[1c]
Trivia
Considering his name and background, Zadal Crosius may have become Death Guard Chaos Sorcerer Necrosius.[2]