Cuélebre

No single canonical creation myth for the cuélebre is attested in the cited sources. Sources describe it as a longstanding element of Asturian and Cantabrian dragon/serpent lore and include narrative motifs such as a tale fragment in which a maiden is transformed into a cuélebre and can only revert if met by a particular kind of knight (Dragnix legend excerpt). The cuélebre is also placed in broader eschatological/migratory motifs: though described as effectively immortal, it is said to eventually depart to a mythical paradise called Mar Cuajada beyond the sea (Wikipedia).

Folkloric descriptions depict the cuélebre as a giant serpent or dragon‑like reptile. Sources report that in maturity bat‑like wings develop on its body and that its scales thicken over time, becoming described as impenetrable; accounts also attribute great size (capable of eating cattle and people and of holding xanas captive). A narrative fragment records a tale in which a girl's body grows into a cuélebre as part of a transformation motif (Dragnix).

Within regional lore the cuélebre functions as a guardian of caves, subterranean and liminal watery places, and treasures; it is also described as keeping xanas (anjanas) captive. It is said to be effectively immortal yet to age physically (scale thickening, wing development) and ultimately to fly away to Mar Cuajada. It normally remains motionless in its lair, but when it moves it is reported to do so to prey on cattle and people. Folklore attributes a magical byproduct to it: its spit is believed to harden into a stone with reputed healing powers. Folklore also records specific folk‑methods for killing it (for example, feeding it a red‑hot stone or bread filled with pins).