Seven Saints of Talis
The Pillarus Islands is an archipelago found off the southern coasts of the Reach. They are tropical, covered in warm rain-forests and thick jungles, and are home to the Machine Cult known as the Children of the Atom, as well as many of its splinter cults and tactical sects.
The largest island is home to the Mount Pillarus Observatory, a pre-war communications relay that formerly used its advanced auspex systems and communications arrays to direct in-system vox-traffic and observe various celestial phenomena, in addition to tracking traffic in the space-lanes above the planet. Now, it peers into the Warp Storm raging throughout the sub-sector, feeding its data-findings directly to the Divine Oracle of the Children of the Atom.