(4,3)

Hidden within a small valley, at the end of a winding path up a hillside, is a cave entrance, the rocks nearby smeared with strange symbols in what looks like blood.

Within, through twisting passages, is a damp and cold cavern whose far end cannot be seen, where strange scents and disturbing bubbling and sloshing sounds waft across a lightless pool of dark water. In a stone niche, across a narrow beach of mold-slick rocks, at the top of a narrow and slippery ascent, stands a black altar, covered in blood, and adorned with strange carvings that crudely depict various disgusting, inhuman creatures. Above the altar, upon the cavern wall, is stylized painting of a being with two heads on snake-like necks.

Before the altar niche, jutting out from the curve of the cavern wall, is an overlook of sorts, towering high above the water’s surface. Upon it, two thick spikes of iron, as tall as a man and as far apart, are driven deep into the hard surface. They are pitted and stained with nameless fluids and substances, and looped at their top ends.

This is an altar dedicated to the Prince of Demons—Demogorgon.