Earth Hum Caverns

Publisher's blurb:

Whether for glory, greed, or fate our heroes have entered the Earth Hum Caverns, the underground home of various subterranean beasties. There’s more to these tunnels than it first appears though, and the forces of elemental earth are marshaling throughout. Can they conquer the Caverns, or will elemental earth erode them away?

This is a simple dungeon crawl that can easily be dropped into any campaign with minimal preparation.