Quote Originally Posted by Enkidoh View Post
And it appears the mystery is further deepened when it's shown that the Ancients, once again, had something to do with it, as a pixie appears during a certain sidequest later on in Elpis, with the bewildered Ancient researcher assigned to it having no idea who created it or where it came from, suggesting a lack of accompanyning paperwork of it's concept.

And it even turns into a beaver too, that the WoL immediately realizes, and the even more incredulous researcher basically throws in the towel and says in defeat "Now let us never speak of this again," so it's clear the Ancients just... swept it under the rug, leaving the mystery ultimately unsolved.

So, once again... "something something Ancients" are the cause.
That's not how it goes, unless there was an actual appearance by a pixie that I completely forgot about, but I believe you are getting muddled with The Abyss Stares Back where we learn that the researchers just found the shoebill with no idea where it came from.

The pixies are referenced in Unexplained Mysteries – researcher sends you to find his "nymphai" which he refers to as familiars and there is no hint of a mystery behind their origin. You can only find beavers in the indicated search area, and the researcher seems like he might know why they transformed, but he doesn't explain himself and just tells you never to speak of it.

On a side note, I don't understand why we act quite so traumatised by the beavers. The pixies are terrified of them but we've surely recognised what's happening, and they've never caused us any harm.