Moondance is going to refresh him on colddrakes anyway while they get ready. Colddrakes are most likely a deliberate creation from before the Cataclysm, rather than Changecreatures, but they do cope well with the ambient Pelagirs magic. They are extremely dangerous; in addition to their formidable claws, teeth, and tail-spines, they have a native form of mind-magic, a hypnotic gaze that freezes their prey so they can approach it at will. As suggested by the name, they do best with cold; in fact, fire is an excellent dissuasion method against them. They tend to live in clutches, ruled by a queen drake. Most likely one such clutch has decided to nest near the village in question. Moondance would prefer driving them elsewhere to killing them, but they...can be stubborn about relocating, they're a lot more territorial than basilisks, and generally this type of situation ends with dead colddrakes.
(And, unfortunately often, dead scouts. Moondance doesn't mention that part.)