if lona gets infested with parasites, she will gain pee and poo need rapidly while walking around. every time she pees or poops, she will spawn out worms, which do not attack her, but will attack her enemies and everyone else around, occupying them and giving them debuffs when they get infested as well. you or the enemies can also kill them and eat/cook the meat, and they can drop a lot of meat, so you never run out of food.
so now poor Lona is incontinent and full worms, walking around vomiting and covered in her own piss and shit and constantly pissing and shitting herself, but she can deploy half a dozen worm pets into combat every time this happens and this causes a massive distraction that pins enemies in place so you can snipe them.
also, this miserable existence qualifies as "happy (Stack:4)". truly a dark world."