So, it says that lusii are native subterranean creatures. Does that mean that they meet their charges in the caverns or do they have to go out and find some random monster to tolerate them?

“The eggs hatch into young larval trolls which wriggle about to locate a cozy stalactite from which to spin their cocoons. After they pupate, the young troll with his or her newfound limbs undergoes a series of dangerous trials. If they survive, they are chosen by a member of the diverse and terrifying subterranean monster population native to Alternia. This creature becomes the troll’s lusus, and together they surface and choose a location to build a hive.”