Random Encounters Reworked bible

Everything you need to know about RER
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You can control which creatures you will see from RER with the ratio sliders in the menus. But there is also the ecosystem feature that changes what creatures will be spawned.
The ecosystem feature integrates a food chain and relationships into the game. Whenever you kill a creature or you let it live, it changes the surrounding ecosystem. The world is composed of hundreds of ecosystems, they all are different and come with different sizes based on the communities who live in them.

There are a few options to control the ecosystem feature the community diversity controls how diverse your ecosystems will be. Higher values means you will see less diverse ecosystem, which will consist of less species. The ecosystems will be composed of dominant species and RER will often pick these one.
the power spread controls how much a species dominance spreads over the world. But it also works for dominated species where you killed most of its members. Higher values means the communities will spread over greater distances.
the death speed or death rate controls how many members of the communities die per generation. This slider is really important, it helps regulate the ecosystems and avoid over dominating species.

If you want an ecosystem with more impact on the spawn chances, i'd suggest to set values like (in respective order) 15, 10 and 8