The Beast or Beast Planet is an intergalactic menace and threat to all life in the Shadow Riders's universe.
The early history of the Beast planet is largely unknown though it has existed long enough to be become the stuff of frightened whispers in many civilizations. However, most consider the Beast a fairy tale to frighten unruly children.
The Beast's soul purpose is the destruction of life; attacking and devouring all worlds in its path. It will send an invasion force ahead of itself to assess and weaken any resistance before arriving to consume the worlds of a system. It has a particular hatred of worlds visited by the Builders; the ancient race that implanted World Engines in many planets.
At the start of the series the Beast Planet has completed the destruction of the Tek system; devouring planet Tek and is preparing to attack the Cluster.