I already asked this, but maybe it got lost or I missed the answer - do you know if trolls on Alternia are supposed to live isolated, due to their violent nature? Every troll we've seen lives alone in the middle of nowhere (except for Sollux, but on his building there's only his lusus, so we don't know if there are other trolls around), but in the game footage there are train stations and cities and stuff, so I don't know how it works anymore.

Karkat had neighbors. One of them got killed and he invited Terezi to move out of her treehouse and into the empty hive.