Siama Rya (Soul of the Divine), is a large nebula located approximately 80 light years south of Yamatai Star System. Before the nebula existed, in its center there was a binary star system. Nearly eight centuries ago, one of the two stars exploded in a supernova event. This explosion reduced the companion star, Ida Siamaka, in size and strength, and it rendered barren the two planets orbiting both stars. The explosion also formed the nebula itself.

This nebula is where legendary leader of the Ida Siamaka, Kotoz Mui, led the Poku'vonai to conclude their Poku'vonai. They settled in the Degonjo Saeruo (Hidden Sun System) in the center of the nebula.

Practitioners of the dominant faith of the Poku Saeruo Degonjo consider the surviving star to be linked to their concept of a divine intellect which they call Siamaka.