Judges Guil - The Caverns of Thracia

From the back cover:

"They Have Been Waiting.

For over a thousand years the things that lurk beneath the waters, skulk in the darkness and lie hungrily in dank crypts have been patient, while all around them men and monsters bicker among themselves, bold enough to traverse the dark caverns' depths, but afraid or perhaps wise enough to leave the forgotten vaults and hidden passages alone.

And still, they wait, undisturbed. They are waiting for you!"