So I encountered something strange about the Dark Spire... The attached save is a Fallen Spire game. Looking at the map, it should be obvious where I put my few brick walls on, and that is not important.
My territory contains two Dark Spire Vengence Generators, both of which are unoccupied(deliberately), and has triggered before when I blew up the AI systems. However, I find that the DS spawns at mysterious and unpleasant times.
As indicated by the save name, I was just about to build City 5. Press 4 to get to my group of engineers, place down and build the hub, and you will see. Somehow Dark Spire is triggered, releasing those terrible ships right inside my econ farm, but nothing ever gets destroyed on any DS planets. The same was happening when I constructed City 4. It might be a coincidence of my Scout Starships dying inside AI territory, but I didn't find out. Why would dark spire spawn?
Yeah, I heard that they were chaotic when first introduced. But now they seem to be more of an annoyance than those !!fun!! exponetnial growths.