Theshigen writes “Theyve teased us in the run-up to the launch of Crusader Kings III. Now we have a sneak peek of the Ruler Designer feature that will be dropping together with patch 1.2. Might I add, the Ruler Designer will be FREE together with the update.”

Source: N4G PC Crusader Kings III Ruler Designer Detailed. Coming Soon in the Free 1.2 Update Frags of War