The late game crisis is such a good idea to solve this problem. At that point you're strong enough that you can beat all the other empires but then an extra-di

The late game crisis is such a good idea to solve this problem. At that point you're strong enough that you can beat all the other empires but then an extra-dimensional invasion happens that's just so much stronger than anything else you've encountered and it works really well to spice up the late game and make everything relevant again.