In a twist of fate, it was the pesticide used by the villagers which turned out to have these effects. Years ago a wandering salesman visited the land, offering the "finest cure against all vermin". It was a curious, metallic dust, which even glowed in the dark! For demonstration he blew it on locusts, rats, even a captured raven and they all died within a few hours. While slow and underwhelming at first sight, he assured the villagers, it's the most efficient killer given enough time. And safe for humans of course (at this point of the routine, he even ate a spoonful of it)! Somewhat reluctantly, but people started buying and using the curious dust, as harvest was very bad that year and rats were chewing up even the little they had. Sure enough, after a few days the rats started dropping, but not all of them had a high enough dose. The villagers quickly ran out of the dust and the salesman never came again (some say he was struck by a mysterious illness), but the effects lingered on in the sewers, culminating in the birth of Rupert and a new race of subterranean horrors.
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