The research done by the Fuentes on Muta 6500 years earlier had been in pursuit of that goal—but had gone horribly wrong, dooming Fuentes and Greenstrider and Unity individuals to a disembodied but tortuous existence.
Fuentes' investigation into Muta 6500 years prior was aimed at achieving this goal, but it ended in a disastrous outcome that left Fuentes, Greenstrider, and Unity members without physical form yet enduring severe suffering.