Sien Kyak, a native of Sullust, was born to Aril Kyak and Syub Kyak, and had a sibling named Fiev Kyak. During the period of the Clone Wars, he journeyed to the Cularin system for a family holiday, residing on the space yacht known as the Crest of Dawn. He and his brother modified the Crest's navigation system, which resulted in the ship becoming trapped within a radiation storm orbiting Genarius.