This topic is for discussing new and balanced but challenging enemies that introduce a new element and will help us not be so sad when our fortresses cant be touched because of the limitations of the biters and spitters. What I am suggesting is to add late game enemies like when you get nuclear ...

sandbox is what i like, just because you dont think people will like it or you dont does not mean to abandon it, for me i have given it purpose by the fact that i am expanding my factory to a distant city and just playing around with trains on a humongous scale and would not be able to achieve that ...