Penultipox- A deadly disease has spread throughout the galaxy, crippling the growth of organic species and killing trillions. Only one civilization will be able to develop the cure and once that is done the only way to get it is to trade for it. If you develop the cure will you trade it to the other civilizations that need it or keep it to yourself? If you aren't the first to develop the cure what will you do to get it?
I don't like it. Why can only 1 civilization research the cure?
Colonies no longer grow beyond the initial citizen (this was crippling food production for human and AI players)
What happens if you fire the admin for the planet? What happens if you conquer an enemy core world? Are you stuck with the population?
I'm curious about the Manti. Is it still difficult to invade them? Last I checked, they get free fighters to defend their worlds every 2-3 turns. If you don't have enough transports, new fighters will show up and break the siege.