A fiery flying serpent is a creature that people believed existed long, long ago. It's a type of serpent or snake that could fly through the air and had bright fiery colors.
Now, snakes are usually not very good flyers, right? They don't have wings like birds or bats. But people in ancient times had some pretty wild imaginations, and they thought these snakes had special powers that allowed them to glide through the air.
The "fiery" part of their name comes from their bright colors, which included fiery oranges, yellows, and reds. People in ancient times saw these colors as being very powerful and magical, so they thought the snakes must be very important and powerful creatures.
Overall, the fiery flying serpent is something that people believed existed a long time ago, and it's a mix between a snake and a magical creature with special powers to fly and bright fiery colors.