The Keeper

In the wild lands, in the midst of the forest, a tower emerges from the woods. There, an evil entity, known as The Sin Eater, extends its shadows. The watchtower is long abandoned, but now an old farmer lives there and guards it with fierceness from the hordes of putrid creatures sent by the Sin Eater. However, this is not a common tower, it has many secrets unknown even by the keeper. But what are these secrets? What power this tower possess? And what are the keeper motivations to continue fighting and protecting this mysterious tower?