Mexur is the firstborn son of Crausaar. In his youth, he lived with his siblings Jextil and Pervil in the mountains near Duldrus, under the protection of their father. During the Growing Moon of Year 426, In Crausaar's time of dying, he entrusted three humans to take care of his children while Seth prepared a new home for Mexur and his siblings. Scythe cared for the young Mexur until Seth finished his job in the following Bleeding Moon.