Xenodenial

Xenodenial, Denvolism or xenoskepticism is the belief that extraterrestrials are biological fabrications of Terragen origin in the Orion's Arm universe. That is, there are groups who believe that the extraterrestrial species contacted by humans (such as the To'ul'hs and the Muuh) are nothing more but elaborate hoaxes fabricated by humanity's posthuman AIs.

Introduction
Though xenodeniers rightly point out instances where transapient AIs have rationally designed entire ecosystems just to deceive other Terragens into believing that they had evolved naturally, such events are rare and xenodenial is considered a gross generalization by the Encyclopedia Galactica. One notorious example was the discovery of the Whuffies on the planet Bix-VI, first thought to be a naturally-evolved sapient species, but later exposed as fabrications by a mischievous AI called "Progenitor Lord".

Supporters
Within the Orion's Arm civilization, xenodenial is seen as a fringe theory by large. Two of the most long-lived and well-known communities of xenodeniers are the Empty Universe Foundation and the Lonely Minds Society. Interestingly, the Lonely Minds Society is currently led by a To'ul'h named Th'sh'th'han.

Varieties
Xenodenial comes in a wide variety of different positions. The most extreme xenodeniers dismiss even the most primitive extraterrestrial bacteria as fabrications. The Lonely Minds society is described as one of the most liberal xenodenier communities, acknowledging extra-galactic radio emissions as having genuine extraterrestrial origins. However, they still dismiss extraterrestrials within the Terragen volume as hoaxes.

Purpoted reasons
Xenodeniers have offered many explanations as to why Terragen transapients bother faking entire extraterrestrial biospheres and civilizations. The first proponent of xenodenial, Tramel Denvol, claimed that they do so because Terragens would otherwise be unable to handle living in a lonely universe.