Honestly, I think the prologue is unnecessary. It's nice world building and all that, but its just too much and its a huge info dump. As a reader I'd probably skip it and not read any of it.
If you are going to start with any kind of info dump start here:
"I found out that dragons have been
going missing in this town among other weird
things happening around here, fought a spider,
bat, and a wolf monster, had a bounty placed on my
head, unwillingly made some new “friends”, and
found out that I and those friends were chosen by
Queen Windetta herself to be partnered with
ancient elemental spirits, gained some (honestly)
pretty sweet armor and powers, and learned to
pilot giant robots. All to be inducted into a war
against some long thought dead warlord and his
army of science experiments gone wrong."
Even that seems a bit long and tiresome. Where you start that action is good, people will figure out your world as you go. A lot of the alien world type stuff you can illustrate in your backgrounds, that will help people understand that your characters aren't on Earth. It's not even particularly important about the history of the Netherworlders, since your characters are on a mission against them, your readers will imply they are a separate group of creatures with their own history. Which you can elaborate on later.
For example, in the book/movie the Hobbit, you don't get a big explanation about how Hobbits and Dwarfs came to be in their world, you just accept that there is a Hobbit in his hobbit hole, and he doesn't like adventures. You learn as the book goes by that hobbits in general don't like adventures and there are separate races in the world and they act in particular ways. Sure the book Silmarillion exists as a world building explanation, but its a separate book, and you can read the adventure of Bilbo Baggins and enjoy it without ever having to read the Silmarillion or know anything about the Valor or how the world came to be.