The Dam(ned) Lodge of the Beaver Draculas

From the introduction: At the mouth of the river lies the dam - a leaning, tottering mound defying physics in its continued structural integrity. Rumor has it that the dam shelters a violent colony of bloodthirsty creatures, though no one who’s investigated their lodge has made it back with confirmation. At the bottom, there is said to be wood imbued with powerful magical energy - years of cursed air and blood from untimely death must amount to something.