Re: Space Monsters!!!
If you want to make it so that players/AI can't take the space monster's hive planets, give them a facility that give +10000% ground combat. Their militia will make conquest nearly impossible, forcing players to bomb their planets into oblivion. (The facility should be pretty high in their priority, so you can't take a hive planet after they build the other goodies but before they their anti-ground stuff). Just make it cheap to build.
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