The kingdom that Kate and Lina were summoned to was known as the Lanton Kingdom. A rather large kingdom because of their advanced and perfected method of summoning otherworlders. Not only did they have the otherworlders become sentient weapons for them but the remains of their shells along with those that were considered dulls were sold off as a variety of things to the other nations and kingdoms. They also had currently cornered the market on the currency of the world as well because of this too, THe diamond like substance otherwordlers minds and bodies became as a result of their smelting process was the world's currency after all. It was impossible to counterfeit and thus consider the most readily in that aspect.