The Thorian, also called Species 37, is an ancient sentient plant at least fifty thousand years old - its ability to hibernate for thousands of years makes its real age impossible to guess. The Thorian is a unique creature with mind-controlling and telepathic abilities, and a massive sensory network. It releases spores into the air that allow the Thorian to control those who inhale them, using pain to control their behaviour. These 'thralls' then tend to the Thorian and obey its will.
According to the VI at the ExoGeni Corporation Headquarters, the Thorian is essentially "a weave of tendrils" that covers much of the surface of Feros with some sensory tendrils kilometres long, though in places they are gathered into nerve bundles or neural nodes. Though it is intelligent, the Thorian only regards other sentient beings as potential thralls. It describes itself as "The Old Growth."