Heglum, a quite lightweight gas, saw usage within dirigibles. Occasionally located within nebulae, it would rapidly form a bond with a starship's sublight drives. To maintain peak operational effectiveness, starships traversing heglum clouds must routinely have their drives cleaned. The planet Stroiketcy possessed heglum, malsarr, and iridium held in suspension within its surface oceans. Heglum and iridium were both abundant within the Kathol Rift.