Larb was a bat living during the Age of Fire.
He followed the Firemaid Yefkoa during her voyage to search for the Siblings in Sadda-Vale, because he was motivated by a strong loyalty toward the former Tyr RuGaard and bearing the hope to bring the old Tyr to change things in Lavadome (because bats were going to be all killed as vermins).
Once in Sadda-Vale he remained there, hoping to find RuGaard, giving his services as messenger to Scabia.
He later proved a great service to the Archelle of Sadda-Vale, when he warned Scabia just in time of the attempted murdering during the Raid in Vesshall.