The Beast of Willow Lake

From the introduction:

Willow Lake is the name with which both a small village and the nearby lake are known among the peoples of the Three Lands. Hundreds of years ago, the lake of Willow Lake was not in fact a lake, but a foothill dale - hence comes its name, from the ancient Elven name of the valley Ouiuìleigh or “Whispering Meadow”. There are in fact quite no willows in Willow Lake; the trees of the nearby forest being mainly maples and oaks.