Upoan approach, there is a chill in the air. The chittering of vermin grows quieter and soon are an eerie silence. Stomachs turn with slight nausea and feel slightly light headed. This place has a dread about it.
Inside a massive pinnacle. Much wider than the others, more than 600 feet wide and 400 feet deep (1200 feet high). It stretches up beyond sight. No animals or vegetation grows on this pinnacle.
The cave entrance is about 1000 feet from the surface of the Serpent’s Lair. A waterfall pours from it and separates into a fine mist before it ever reaches the water below. The cave is pitch dark inside.
100 feet into the tunnel is a large stone door. Goes into the water leaving a five foot opening below. It is not of quality make. It opens using a large lever on the inside that flips it up from a top hinge. It is not locked.