Elmo was an experienced sergeant and officer of the Black Company during the time of the Books of the North. He was a long-standing member of the Black Company and sponsored the membership of Croaker. Croaker also considered Elmo to be his best friend among all of the Company's members.
Elmo served as second in command of the Black Company after the death of the Captain through the end of their time as soldiers of the White Rose. He was slain during the final battle against the Dominator at the Battle of the Barrowland.