Leave the Athlum Palace and visit around the city to find Soldiers standing around again with red speech bubbles. Speak to them to learn your presence is requested by David. Proceed to Athlum Castle to further the story. You will now need to manually set up your other two unions. Although you can use any combination of units and don't have to create three total unions, it is most common to make three unions of three units each. The Ivory Peaks is now available on the map.