Few races can truly give most a cause to be afraid, save for the Mosterian children. Once laid in a stone egg which grow into a small boulder size, the adult will throw it with such strength to breach the atmosphere and send it flying into space. There the stone egg hibernated until it drawn into a planet gravity and if the world is habitable, will hatch upon impact and see out sentient life forms. Once it consume enough sentient race and gains their knowledge, they evolve into an adult species which become less savage, but no less deadly.

While an adult form may not consume sentient being as often if at all, their skills in combat excel even most train warrior. Their body ability to stretch has often surprise many folks who believed they had an advantage at range. Their wings can double as fins in water as well as wings in the air, and surprisingly does not suffer any hindrance with either environments. While an intelligent race, they are often aggressive and communicate with body language, an angry growl to represent annoyance or anger, drawing it claws to show it at it tolerance limits, and biting your head off could mean to shut you up or cause they are hungry.