Feared above all other dragons is the species of wyrm that makes the swamps and bogs its home. For it nests near shallow pockets of marshland gas, which it knocks loose and burns with its fiery breath whenever intruders come near.
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Cause it's very rude. He doesn't come into YOUR swamp, mucking up the lovely muck, and waking YOU up does he? No, because Swamp Dragons, unlike some people, have manners.