This universe has a civilization of humans! And some other things. It's not crowded in the way Edda is but it's not just the one planet either. The humans might be easiest to start with. They're on that planet over there, it's not Earth but it has very Earthlike conditions and bronze-age humans living in cities and villages dotted across two large continents. Depending on how thoroughly any prospective visitors look they might find other things before visiting.
They did not give us a name, but we remember well their awe-inspiring power. Trawling these ruined halls and throwing aside stone to dig for shiny treasure, defeating the foolish clans who thought to make prey of a dragon, their spirit burned so brightly! Truly the dragons deserve their reputation as great beings. When we offered treasure and secrets in trade for their knowledge, we learned of the essence of That-Which-Burns, and over several days we were taught to channel it ourselves. It is a powerful secret that has served us well in making the Boom, among other uses.
This odd visitor is still handing out food, right? By now they should have a lot.
After some extensive internal squeaking and some more questions about the other worlds and the magic and the mission of Vanda Nossëo, the rats announce that they will split the family, as they have done only twice before. One family will stay here and spread the news to other rats, the other would like to travel to these other worlds and learn.