human
Write a detailed description of a spooky cave in the wilderness with quartz crystals and phosphorescent fungi.
assistant
At the western end of the lifeless grey beach is a gaping maw of a cavern, carved into the basalt columns by the sea's relentless waves. The jagged interior is pitch black inside, greedily swallowing all light that enters it. Water rushes into the huge opening with each wave, then slowly drains back out again, undulating in dangerous swells, though a thin strip of sand allow safe passage at its very edge.