The cathedrals of the Isylorian Order are truly massive edifices built during the ~1600s PC through 2080 PC on Ares and other colony worlds.
They have enormous central chambers for worship of the Isys’ir, as well as wings for the Curia (administrative, See:Church Structure) and The Inquisition offices and barracks.
These are the strongholds from which the church projects its power.
