The irrlichts (will-o'-wisps) were often seen in the Alt-Seidenberg area, and frequently led the carters astray. There was also a larger irrlicht, which was called "The Great Shining One". It frequently approached from the direction of the Röhrborn near Alt-Seidenberg, and made a curve around the village until it reached the Küppen Forest. While the common irrlichts swayed up and down and were significantly smaller, the Great Shining One moved in a steady course.
— Schlesische Sagen 1 - Spuk- und Gespenstersagen by Richard Kühnau
A boss monster will-o'-wisp!
Or worse, a manifestation of Cthugha...
