After I finished H.P. Lovecraft´s story “At the Mountains of Madness”, the GM in me dreamed about an adventure that would take place in some (other) subterranean ruins of the Elder Beings. Another city or outpost, perhaps smaller, or just the caverns that would lead to its entrance. As I was not able to create a full-blown adventure out of my ideas, I rather created a set of 20 structured encounters. The difference to (completely) random encounters is that some of them are preliminary encounters that will trigger certain other as a follow-up (or will be triggered instead of their follow-ups). A simple frame was given for the encounters, as well as stats for six creatures and two strange items.