Luther developed the core simulation routines for universe construction, based on multiple time axes, that made possible the Eternal Sphere project. With him as the lead developer, the original team was composed of Palmira Armes, Eleanor Duran and Irisa Pahm. He personally created the Firewall to prevent the entry of hackers and government-backed viruses, and Spiral Tower to store data.

During the development of the Eternal Sphere, Eleanor had a conflict with Daguon, who attempted to destroy her using various underhanded methods. Eleanor took him to court and won a lawsuit against him. It is unknown if Luther was involved in the incident, but what is certain is that Luther succeeded Daguor as the president of Sphere—earning the hatred of Daguor's son, Belzeber, who believes the company to be his birthright—and turned the company into a juggernaut. Luther thus left his directorial duties of the Eternal Sphere project to Berial, perhaps due to Sphere being the de factor ruling body of the Lost City.