Great idea; poor follow-though. Maybe I am missing something, I thought this was the race that wants to REMOVE all other life in the universe. Oddly though when I was doing a run though I felt more like I was playing a improved version of wack a mole. Let me explain, I had an empire to my north that I could cleanse down to 1 planet then after 10 years I would have to go to war with them to take them back down to one planet. If i made them a vassal would have to watch as they retook and expanded only to let them go and do it all over again. I kept trying to find the "Cleanse empire x" in the war demands screen sadly though I am fairly sure that it is not there. Any good way to "remove" an empire permanently short of making them a vassal, integrating them and then purging them off?