Due to the fact that a whole God Damn Dragon Skeleton appearing at the bottom of the Volcano, a lot of confusion has struck the town. It was visible from the very middle of the Volcano, and the word spread like Wild Fire. Everyone in town knew about this mysterious Skeleton of whom Lava doesn't burn.
No one, including the Oldest Calidum Lutum (Xalk) doesn't know the origin of this Skeleton, it just doesn't add up. The Calidum Lutum don't have a history of Dragon slaying, but there is a theory about this Skeleton that might be believable.
What if the Ancient ones, just found this Cave and reached a special spot that has a big hole in it, they throw a rock down it and they can't hear the rock hit the ground, which signifies that it is very deep.