It adds stars to Stellaris which are going to go supernova after a certain amount of time.
This mod is another one where the name is pretty descriptive.
With this mod, you are presented with a choice for how to approach resource management on your worlds. This mod helps with a rather immersion-breaking aspect of the core game: namely the fact that it feels like you don’t have to care about the environment of your colonies or worry about the consequences of your exploitation.
This mod makes the way the AI empires view you much more interesting as it now considers many more things. 14.” Better Diplomacy: Realistic Opinions”
Check out this list of some of the best mods for Stellaris 2.3 as of right now.