Demartin used to serve as an agent under Chancellor Casimir. When his boss was charged with high treason, Erik sided with the King without hesitation – which resulted in his promotion to position of "The Undersecretary of Security" and giving him command over Drakenborg.
He restructured the Service thoroughly, aiding Redania during the Great Tariff War with Kovir and Poviss which ultimately led to the Secession of Poviss and subsequent events in the north, allowing Radovid IV to annexate Yamurlak after Old Abrad's death.
He died in 1235 as the most well-informed man in the Northern Realms. His possition was left vacant and the superiority over the Service was held by the Secretary of the State Michael de Noailles.