First appears in: The Death Edge
Hidden within the Muir Woods, Receiver Site Alpha is the secretive ground-based anchor for the Cothellon's Ascension plan. When Elanil breaches the invisibility illusion hiding the area, she finds that the forest abruptly opens up into a "vast earthen pit, with metal buildings and a huge claw-like contraption taking up most of the space". One of the corrugated metal buildings bears a warning sign identifying the location: "Fennas Elenathon / Receiver Site Alpha / Building 26 / CAUTION / High intensity darkprime emissions in this area!".
The site is of apocalyptic importance because it is "The place where the great city device got its power from the core of the planet". It acts as a conduit, beaming the planet's core energy upward to the United Sky Cities to fuel the massive gate required for the Conjunction. During the climax of the first conflict with the Cothellon, Arra infiltrates the "earthen pit" and witnesses the full scope of the receiver site before she uses her newly awakened Prime magic to level the facility and destroy the claw device.