Ceruleum (Unending Codex)
For centuries, the Garleans warred with the Corvosi for control of the warm and fertile lands south of Ilsabard's central mountains, but they were eventually defeated and driven into the northern wastes. Winters in the Garleans' new home were harsh. The northern seas were bound in ice for most of the year, and the resources of the waters were available for only a slim window. Likewise, farming and rearing animals were possible only at certain times. The land, in other words, could not support a large populace. The Garleans multiplied slowly, and over time were forced to accept being few in number. There was but one benefit to the frigid land—its vast deposits of ceruleum. This deep-blue liquid burned as well as oil, and kept the hearth warm during the long, dark times of year. Indeed, had it not been for this natural resource, the Garleans would not have survived the severe winter cold. Yet, it was to be a long time before the advent of the ceruleum engine, and the Garleans realized what a boon this liquid was.