Gutterwyrm

Old miners say dragon blood seeped into the stone long ago, mutating a brood of tunnel beasts into something half-scaled and half-omen. Scholars disagree, though few have seen one long enough to study it calmly. The truth is simpler and worse: gutterwyrms are opportunists that learned the shape of dragons because it makes prey hesitate. Their odd anatomy lets them breathe through foul water, sense vibration through masonry, and move through tight drains that would choke a true dragon. In places like Scalewarren Underkeep, they are often mistaken for lesser drakes until someone hears the scraping of their tail fins inside the walls.