This mod will help you clearing the map in the late game by making vassalization viable again and reducing the amount of warscore needed to capture planets.
Steam Workshop ID: 695777066 By: [.LAS.] Dr.Med.Hätzlon
- Reduced Vassalisation costs for small and medium empires
- Reduced Cede Planet costs for medium and large empires
- Empires up to 20 planets and 13 pops per planet can now be vassalized in one war with about 100 warscore
- Large empires planets can now be ceded for half of the vanilla costs, so at max you have to attack them 3 times to get rid of them