Reldo Trimmly is the librarian of Varrock Palace. He is 28 years old, meaning he was born in year 141 or 142 of the Fifth Age. His library is located at the north-western corner of the castle, in the room to the right of the tower. He researches ancient tomes for Lores and Histories about RuneScape. Despite his relative youth, he is considered one of Gielinor's most learned humans.
Reldo makes a minor appearance during the course of the novel as the apprentice to the Varrock Librarian at the time. At the time, he was involved in a project of creating a new indexing system to better organise the books held within the library's shelves. He later escorted the Misthalin Embassy to Paterdomus in order to help administer The Blood Mark to protect the embassy throughout their mission into Morytania. It is revealed that Reldo has an amazing memory, able to cite anything he has ever read with ease, although he has trouble recalling images. Although he has demonstrated many times his adeptness at his job, he never gained the full respect or trust of his mentor.
During the novel, Papelford is sacked as archivist for the Society of Owls for making constant errors and being uncooperative, and is replaced by Reldo. With this he gains access to Papelford's personal vaults, which he uses to help discover a ritual blessing formerly practiced by kings of Varrock to strengthen the Salve.