Cuélebre

Cuélebre (Asturian) or Culebre (Cantabrian) is a legendary creature in the mythology of Asturias and Cantabrian in northern Spain. It is depicted as a giant, winged serpent-dragon that inhabits caves and guards treasures, often keeping anjanas captive. Over time, these creatures age, their scales become impenetrable, and bat-like wings grow on their bodies. Although immortal, they eventually leave their homeland and fly to a mythical paradise called Mar Cuajada, located beyond the sea.