Into that Vast Expanse
The Temple is one of several “stations of passage” in the Koronus Passage, a calm spot in the warp storm for travelers of the Maw to exit the Warp and catch their bearings. It is characterized by a collection of spheres that orbit each other in a beautiful, mysterious pattern.
Caldar Raethos discovered that the orbs were designed to conceal the controls to a Warp Gate leading to the Jericho Reach. Activating this gate, he led his crew through and established trade relations with the xenos on the other side. Through shrewd negotiations with Administratum and Navy officers, the Raethos Dynasty was permitted to tax and regulate all commerce through the Gate, rendering appropriate Administratum tithes.
The Gate did not stay in Raethos hands long before it was seized by the Adeptus Astartes. A splinter of Hive Fleet Behemoth was discovered in the Jericho Reach and the Astartes recognized the strategic significance of the Gate. The former Raethos trade hub was converted to a space station catering to military personnel on leave—a profitable establishment but nowhere near the value of their former holdings.