Dragons
No fantasy world would be complete without a note about Dragons and Oberon is no exception.
Dragons are magnificent flying reptiles of the species known as "Pyrosaurs". A newly hatched dragon is the size of a human male whilst adult ones can reach 'gargantuan' proportions. Each adult dragon is capable of flying hundreds of kilometers a day, at high speed and can breathe enough fire to incinerate a cohort of men from beyond arrow range. Dragons are also voracious eaters and will consume multiple entire farms of livestock each day. They are immense, terrifying creatures that no-one would ever have to face.
Luckily though this isn't a concern for anyone as dragons are not native to the lands of the Empire. It is widely known that dragons, if any still exist, come from a land far to the west of the Empire and don't travel to Imperial lands with any frequency. The last time even a single dragon was recorded in the Empire was hundreds of years ago and that wasn't even a fully adult one - the prevailing theory was that severe weather had blown it off its intended course and it somehow managed to reach the shores of Kalevala.