An outpost built by the ai on top of crystal cannot be attacked. I've a saved game demonstrating the problem, but cannot see how to upload the file.
Yes, Stardock really do need to put a block on AIs building in places where it's obvious that human player shouldn't, and never can. And while they're at it, put a block on more than one Burning Blade on each eligible unit. Go on Stardock, I know you can do it!
While your at it, AI's aren't restricted on how close they can build outposts to each other. Very annoying.
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