Yifaii was a Ssi-ruu who participated in his species' forays into the galaxy in search for subjects for the entechment process. During this time, he served as Entechment Chief and Firwirrung served as his assistant. This fleet was responsible for a raid against the planet G'rho where Dev Sibwarra was captured. The youngling was not enteched and Unit Commander Th'twirirl passed the Human child to Firwirrung.