The sole man-made construction within the ThonBoka, which is a nebula situated in the far-off Open Sea of the Centrality, was the Cave of Elders. It is thought to be the single structure ever erected by the indigenous Oswaft species, and this Cave of Elders functioned as a crucial assembly point for them. Positioned among the three diminutive stars residing at the nebula's core, the Cave of Elders consisted of a revolving 20-kilometer sphere composed entirely of valuable jewels, meticulously crafted to mirror the ThonBoka in its entirety.