[@Dark Cloud] Becuase 40k runs on neo-medievalism, Guilds sometimes take the place of companies and corporations (although those still exist.) Think of them as the Water Company and the Natural Gas company but as mega-corps. Promethium is a fuel source that can be used domestically for heating and lighting but is primarily used [s]to violate the Geneva Convention[/s] as fuel for flame throwers. Think of it as super space napalm. 

They're not unique to Kordial and can be found just about anywhere there's a hive world.