Ragnar Volarus is a Stained, the class of the strongest and most deadly of the Obsidians. He is also the son of Alia Snowsparrow, the Queen of the Valkyrie, and brother of Sefi the Quiet. He had been a slave to the Golds for more than 25 years, during which his sister Sefi had vowed to remain silent, thus earning her nickname. He was freed by Darrow in Golden Son and subsequently declared loyalty to Darrow and his cause.
In Morning Star, Ragnar aided Darrow in capturing Kavax au Telemanus and Quicksilver. He led Darrow, Mustang and Holiday ti Nakamura on an expedition to his clan's home at the polar regions of Mars in an attempt to rescue his clanpeople from slavery to the Golds, but was fatally wounded by Aja au Grimmus during a fight before being able to do so. He managed to meet Sefi one final time before his death.
When Darrow first meets him, he is much like any other Obsidian, unswervingly loyal to the "Gods", and thinking of himself not as a free man, but as a slave to their will. After Darrow frees him, however, and explains his own upbringing as a Red, Ragnar follows Darrow with fierce loyalty, and a newfound desire to free his people from their thrall. He is stoic and wise.
- 'I am and always have been son to the people of the Valkyrie Spires. Born free to Alia Snowsparrow on the wild pole of Mars, north of the Dragon's Spine, south of the Fallen City.' - Golden Son, Ch. 50: The Deep