From Core Exiles Wiki
Beware when traveling the surface of Kostroma, many visitors have been lost to its treacherous environment. If the many quicksand deposits don’t get you then the Kostroma Dragon certainly will do the job. These dragons are enormous dark colored creatures that burrow themselves into the sand. From a distance the mound looks like nothing more than another small hill in the desert, and once you are close enough to know otherwise then it is already to late. Ventures into the lands of Kostroma is not condoned by the local government, nor has it been prohibited. We suggest you keep to the promenades and settlements, but if you must journey outside the safe area it is strongly recommended you do not go unarmed.