Time-bending properties of Ley-line Nexus
I have a Theory: Ley-line Nexus can open up time vortex where Extinct animals can time-travels through there and this can explains lots of Cryptids, good example of this is: Loch Ness Monsters being Plesiosaurs that time travels to modern era from temporal wormhole opened by Ley-line nexus found in Loch Ness lake
and Loch Ness Monster being Plesiosaurs time Traveling with Ley-line nexus aren't the only instance of Cryptids being Extinct animals that time-traveling through modern era.
Sometimes, those Extinct dinosaurs got mutated by exposure to Empyrean upon their time-travels via wormholes that opened by those leylines, making them basis for magical creatures such as Fire-breathing dragons(where those mutations enable their physics-defying biology)
even when some cryptids are can't be explained as Extinct animals that time travels to modern era