He left Largashbur with his brother, Gadba. Their plan is to get rich from mining, then go back to Largashbur and take over. Gadba and Mul can be overheard discussing over who will be the Chief afterwords.
He is the smarter one of the two brothers, as Gadba himself points out.
- "Gadba and me came to work the mine. The plan is to get rich and then go back to Largashbur and take over!"