Not sure where the dev comes up with monster names, but if the name has anything to do with how to get it, I might have an idea
EDIT: but the current web version bug that breaks eggs on save reload would screw it up, it allready requires some ammount of luck and getting the correct event would make it even worse
Also I don't think the dev would expect anyone to figure this out, but I have an idea, I'm legit investigating greek lore rn, nessa is a Pierides, who got turned into a bird after losing a singing contest