Okay, so from watching a friend play a bit, it seems there’s something really stupid in the way the game handles war goals. Tell me if I’m wrong.
War score is 0-100, representing a percentage of how badly you’re kicking their ass, basically. If you get to 100% it’s because you completely defeated their military and are wrecking their bases/planets/occupying/etc.
Since it’s a percentage, it scales with empire size. If you’re facing a guy who has 4 planets and 40 ships, then occupying 2 of those planets and destroying 30 of his ships might give you an 85 war score. But if you’re fighting an empire that had 50 planets and 500 ships, doing the same thing might only give you a 15 war score. Okay, makes sense.
Here’s the thing, though: the actual demands like cede planet are fixed value, and not relative. So it costs you like 15-20 war score to cede a planet whether they’ve got 4 planets or 50. So if you want to have them cede 3 planets, it’s going to require a warscore of, say, 50, whether it’s a tiny empire of 4 planets or a huge empire of 50.
Which means you can only peck apart big empires a little bit at a time. The most planets you can demand they cede at any given time is something like 5-6 at once, and you have to completely defeat them. So you utterly destroy them and you get 5-6 of their planets out of 50? Whereas if you were fighting a smaller empire, you’d get 5-6 of their planets even if they only had 6.
It makes no sense. The 0-100 warscore is a relative measure, but the 15-20 warscore requirement to cede planets is a fixed value. It means you can demand much less, and have to more thoroughly devastate, large empires.
So what do you do in the end game against big empires? Demand 5-6 planets, wreck them in a war, come back in a few years, demand another 5-6 planets and repeat?
It should match. Either war score should be a fixed value and not a percentage, or ceding planets should be a percentage of their total empire to match up with the war score as a percentage.
Edit: Or in case I was unclear somehow, if you wanted to go to war with a 50-planet empire, and demand 25 of their planets, it would cost like 400-500 warscore, which is impossible since warscore caps at 100. So you could make such demands of a small empire, but it’s impossible as you get larger because you’re comparing fixed values against a percentage.