Sak mythology:
Despite the internet telling you this is a Japanese legend known as Tsuchinoko or Hammerspawn, it is in fact what's known as a Saxon. Unfortunately that name was adopted by a group of Saxon worshipers many many years later making it very confusing. It also goes by another name, Dragon, though that became mixed with a wolf later in time and now people associate the hybrid with the word. It has in fact thousands of names depending on where and when in the world you look but its original name is a Saxon so that's what I'm using. Sak mythology is truly ancient and along with sun worship it's the oldest form of mythology known to man, appearing in cave paintings, though it probably existed even before that but if you go that far back there's no evidence of what humans thought about so we don't know. You might argue that cave paintings appear in the northern hemisphere before the southern hemisphere and that the north believed in Sak mythology whereas the south believed in sun worship so Sak mythology came first, but the fact that the south had no way to write it down doesn't prove that sun worship didn't exist and the Sak worshipers simply got to the stage of writing first. Which is older is indeed the subject of debate since sun worship is the origins of the Jewish faith and later Christianity, whereas Sak mythology is the origins of Paganism which many Christians believe is Satanism. Sak mythology believes in a giant snake called Sira which envelops the globe. They believe that its offspring, the Saxons, were sent down to earth from the sky where Sira lives to teach mankind how to speak and write, which started a rapid acceleration of technology and scientific breakthroughs that caused human to go from pretty much the same state as apes are today, living in trees and only using whittled twigs to catch insects to using tools made from bones and living in huts made from twigs, the forerunner to the stone age. Frequent in this mythology is the appearance of Saxons, black short stubby snakes with silver bellies and a distinctive silver hollow rhombus pattern on their backs. These creatures are said to be able to speak into person's mind without moving their lips and have human level intelligence or even more advanced than that. Varying in size from as small as a thimble to as large as a village, there are countless stories of them saving humans from natural disasters by working together in huge numbers and most importantly fighting gods of nature for the sake of mankind. However, at some point humans began worshiping the gods of nature out of fear of natural disaster and started tearing down forests where the Saxons lived for building materials and firewood. The Saxons appalled by the way mankind turned on them despite the Saxons being their loyal protectors, swore to wipe out the human race in vengeance, though they never delivered on this promise. The humans in response swore to wipe out the Saxons in response, but unlike the Saxons, the humans kept their promise and went on a mass killing spree, wiping out every snake they could find. With only a few dozen or so Saxons left they abandoned the Sira cause and went into hiding becoming vagrants camping out in the forest. The humans would have many encounters with them since though the Saxons had switched allegiance to the side of the gods of nature and proceeded to terrorize mankind and steal from them. Only a handful of Sira worshiping Saxons were left and they were killed along with the rest by mistake, except for a male dragon, his son and his mate who shared her heart with a human who promised to protect the Saxons. That human being immortal now became the king of mankind and betrayed his promise hiring a hunter to kill the male and the child but kept the female captive to keep himself alive. The hunter later realized the king's evil after befriending the captive Saxon and killed the king in anger. This unfortunately killed his friend the last Saxon as well. However in some stories the hunter and the Saxon had already given birth to a hybrid child, the first Mandrake, before the mother died and the hunter brought the child up as their own.
