SFRMDOTS

Seven Fallen River Moons Dancing Over The Sea aka Seven, Moons or (f)Allen

Some sort of evil spirit whose evilness is up to debate. Silent, a watcher. Protects his home lake with passion.
He lives inside the lake cave, and will usually never go outside unless its necessary.

Mortals of neighboring towns know something or someone is there. Some say the lake is cursed. It ain't far from the truth.

By all accounts, people who littered the lake or fished there are found dead.
It is a sacred, yet feared place. Noone has dared put their feet around the lake in a long time. And the ones who did usually don't come back to tell the tale.

He has ben isolated from everyone, including other supernatural creatures for millenia and hasn't said anything in that long.
There is simply noone to talk to. He may have forgotten how to talk, even. It's not like there is any reason to try anyways.