More Lore Stuff!!
I now have a theory that indirectly connects a bunch of stuff. Let's start with fizz. This little thing leaves his home one day, and returns one day to find it abandoned. That's not good. So, here's what I think. A few things we don't know: how long fizz was gone, when nautilus discovers the "black ooze" where the "black ooze" was in relation to fizzs home, and how fast the "black ooze" can travel if at all. Here's what I think. Fizz leaves, "Black ooze" (which I believe is some biochemical hazard from zaun that seeped into the guardians sea, via the sewers, since the two are so close together) that ooze kills his race, fizz is still gone for a while after. *note: Fizz's city has never been found. Naut is travelling with his crew into the deep ocean where Fizz's city possibly is near, since his lore states he was travelling in the guardians sea where no other sailor had ever been. He gets killed by the "black ooze" and washes up on shore. Fizz comes back and his people are gone. The end.