Native American legends based in Maine tell the legend of two powerful shamans who met for a magical shape-shifting duel. When they met at the agreed time, one of them took the shape of the kitch-at’husis, a 40-foot long water serpent thingie with poisonous fangs.
The other shaman turned into a weewilmekq. He knew the only thing with a chance of beating the kitch-at’husis was the giant leech.
The leech won, sucking the life out of the dragon.