The karstag had an elongated neck and a triangular head. Its eyes were located at the top of head to allow visibility while the creature was submerged. Its mouth was lined with teeth and included one prominent incisor at the roof of the mouth and two at the bottom. A bone-like club with large spikes at the end of its tail was used by the animal as a weapon and was what made the Rodian karstag so dangerous.
The Rodian Karstag was hunted for sport during the annual Vor-cal on the planet Vilhon in the Tapani sector. It was served roasted with Algae-bread stuffing at the Vor-cal Feast.