>>66720509Oh also, ecosystems usually need some source of energy at the bottom of the pyramid. For most life, that's sunlight, which feeds plants, which feed herbivores, which feed carnivores. In a cavern, that source could glowing stones, or just magic energy appearing in some funky mosses, but you could also have the energy come from a geothermal source. That's what ecosystems next to hydrothermal vents do and that's why they're full of life even though they're usually at the bottom of the ocean in the barren abyss. Thought of it since you mentioned volcanism. Of course it can also be a combination of all of the above, or something else. Having everything feed on literal rock sugar is neat too, I vaguely recall something about Biboo's feet tasting sweet.
