The Phase Factory was a factory bought by the Old Styx in Slough, England. The Styx used it as a multi-purpose base as they began to invade Topsoil, and as the Phase site. They use it to create the "human bombs" to kill foreign politicians and make England go under martial law. Later on, the Styx use it as a Phase impregnation site, where the Styx women can sucessfully put eggs into hosts and create Warrior Class Styx. It appears in Spiral.