O5-10, The Archivist, plays the role of archivist and record-keeper. They act as custodian of the records of previous iterations of the planet and associated timelines. Being the Archivist, they know about events, such as “The Faerie War” and “The Deal Between James Anderson and O5-1”. They also know about the events of SCP-001, The Factory, and the Factory’s founder, James Anderson. O5-10 is O5-1’s left-hand person, with O5-4 being O5-1’s right-hand man. They are quite jealous of O5-4.