Erchius Horrors are creatures that naturally feed off of erchius crystals, as well as using crystals itself as a shelter, incorporating it into its own biology. They presumably use the heat produced by the radiation from the Erchius itself to create searing plasma and expunge it from its' body as waste, or as a weapon to defend its much coveted crystals. They are theorized to be in a symbiotic relationship with the Erchius, providing it with ample amounts of bio-electric energy (both from its own body and from captured prey) to feed on in exchange for the Horror to feed off of the crystal and use it to create its' shell. A Erchius horror naturally grows from a Moontant, as it continues to mutate and the erchius crystals continue to grow on the Moontant, an Erchius horror forms. The intelligence of the horrors is disputed, but it at least has some semblance of sentience. Most Erchius Horrors are upwards of hundreds of years old, from before the planet they were found on was reduced to airlessness.