I'm sorry! If it's any consolation, pretty much all my guesses about where the story is going have been wrong so far, so this one probably is, too. And I also want Onni to stay alive and safe!
Hmm, I mean I can't see any way of it happening but there's also the other four members of the support crew, all four of which are either biological family or honorary family to a main crew member so their death would still be feels worthy if nothing else to see our dear main crew member get all emotionally wreck'd over loosing a family member / honorary family member. I mean again I couldn't see a way how they're safe back in Mora and can't do the mage stuff like Onni (that we know of) and I don't know if it would even fit the nature of their character to be killed off but, idk.
But yeah I've been a bit worried about Onni too D: