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In the advanced map editor, configure the TownBuildingSharedStats table; find Dwell7 for the Dungeon faction and open the building properties (properties window: View => Selection Properties Window). There, you will see Creature1 specified as the creature for the built dwelling – replace it with Faceless Ones; for the upgraded dwelling, both Creature1 and Creature2 will be specified: replace them with the Faceless Ones' upgrades and alt-upgrades.