Hive thoughts
Eadina probably lives in a cave/mound of sorts in the desert, kinda near where the desert meets forest and greenery. Her lusus is large enough to curl around it and protect it.
Orpice lives in lowland forest near rivers and marshes. His hive might be in the base of a tree or possibly a fallen tree where he uses the roots as foundation.
Kubiek is very ??? I got no ideas biome wise hahaa But I guess him and any trolls past him live in properly built hives…
Zaibas lives higher up on hills or a cliff, possibly bordering a mountain range. (he prefers skies not blocked out by trees, plus him and trees would be a bad idea)
Natica is also in the forest but a lot closer to the mouth of rivers by the sea.
Illesh lives on a small rocky island just off the coast which is connected by a tombolo. Most of the time you can just walk across, but during storms.and super high tides you can’t.