Umkazol, the great King of the dwarvish realm of Delakmad, is an accomplished engineer obsessed with numbers and calculations. As an expression of these interests, he ordered the construction of a complex system of dams in the Tish Valley. The opening and closing of the dams is controlled by levers. This whole system is a complex calculator; numbers and operations are specified by a combination of levers, and results are displayed by the channels and reservoirs into which the dams direct the waters of the River Tish. The making of Umkazol's calculator caused a war between Delakmad and the human kingdom of Rodar, whose fields were no longer watered by the Tish.