Hey, I finally got around to visiting Rabbasca for the first time in my current play-through. It's a moon of Fulgora for some reason but no matter; the lore you paint with research, naming conventions, and the moon itself is awesome! Did you get inspired by something? Is there more? If there isn't, is the lore licenced in a way I could use it for non-commercial fanfiction?

Hey, glad you like the mod :) There is a setting for which planet the moon orbits, default is Gleba, maybe something changed the setting.
The initial plan was to make something based on the rabbits on the moon mythology in a setting where players can control the difficulty by choosing how much they engage with the planet's mechanics. That somehow led to a carotene-addicted civilization with powerful defensive technology.
Feel free to use the lore for anything, everything except 3rd party assets is MIT licensed. I am planning on a followup expanding on the warp-technology parts (see https://mods.factorio.com/mod/rabbasca-underground) but it is far from finished and currently not my main focus.